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Ravnica Block (2005-6) Featured Combos.
Last updated 2/15/07 (112 Combos, 36 Deck LInks, 8 Infinite Combos)
NOTE: Due to errata, Time Vault & Flame Fusillade no longer combo together. (Thanks, YWN) ~Streetz~
Discuss this combo page in the forums! [Read the rules of the thread first, please].

Shattering Spree - Mycosynth Lattice 
This combo was submitted by Death_By_Beebles.  This is easy.  Cast the Lattice (or Show and tell it into play) and then go crazy with the Spree... destroying as many of your opponent's permanents as you can afford.  The Spree is quite a powerful spell if you consider all of the Moxen running around in Legacy.  I think it would have been much better as an instant... I guess it's a good thing it isn't.
Savra, Queen of the Golgari - Shambling Shell 
Shambling Shell, as a reminder, is both green and black.  Now with that in mind, sacrifice it.  Savra, assuming you have her in play, gains your 2 life but you can also pay 2 life to make each other player sacrifice a creature.  Net: You gain no life and your opponent's sacrifice a creature each and you get to put a +1/+1 counter on one of your creatures.  Dredge the Shell back next turn and repeat. Fun, eh?
Rakdos Riteknife - Myr Servitor 
Blood counters... Doubling Season can double them, Power Conduit can recycle them into charge or +1/+1 counters and Energy Chamber can't do anything with 'em.  Rakdos Riteknife uses these counters and when you have enough, you can sacrifice the knife and make an opponent sacrifice a permanent for each blood counter on it.  To put blood counters on the knife, make sure it is equipped to a creature you control; then tap your equipped creature and sacrifice another creature.  Why not choose a recurring creatures like Myr Servitor to sacrifice to the Riteknife?  As long as there is at least one other Myr Servitor in the graveyard and in play, you can recur the Servitor every turn during your upkeep.  Once you have a 10 or 20 blood counters on Riteknife, sacrifice it to make your opponent sacrifice most or all of their permanents.  Thanks to Furnacewhelp for the clarification highlighted in yellow above.  Furnacewhelp also suggests Simic Ragworm or Freed from the Real to mix with the Riteknife for added fun.
Phytohydra - Pariah's Shield 
This combo submitted by many, many people so, of course, I'm going to post it!  Equip your Phytohydra (interestingly enough it's a PLANT Hydra) with the shield and watch all damage that would be dealt to you redirect to your Plant.  Phytohydra has a replacement effect so that whenever damage is dealt to it, instead it gets that many +1/+1 counters.  Basically, this translates into you never take damage again so long as your Hydra is in play equipped with Pariah's Shield.  Plus, your Plant Hydra becomes very large depending on how aggressive your opponent want to kill you.  Just beware a Dark Banishing and/or Shatter and/or Naturalize.
Bottled Cloister - Brink of Madness or Ensnaring Bridge or Imaginary Pet!
Brink of Madness is definately a dollar bin rare.  Bottled Cloister isn't (yet) but here's a fun trick for you.  Brink of Madness triggers when you have no cards in hand at the beginning of your upkeep to mind twist them down to zero cards.  The Cloister removes your hand from the game at the end of each of your turns to return them at the beginning of your upkeep the following turn.  Stack the abilities so that Brink resolves first.  It will see that you have no cards in hand and your opponent will have to discard their hand all the while the cards that were in your hand return after Madness resolves.

Bottled Cloister also works well with Ensnaring Bridge if you like to keep your opponent from attacking you. Then there's always Imaginary Pet...

Glimpse the Unthinkable - Circu, Dimir Lobotomist or Twincast!
This is more synergy than anything else.  And, you can replace Glimpse with any other card that has "UB" in it's casting cost.  OK, so you have Circu (weird name BTW) in play.  Cast Glimpse and mill your opponent's library for ten.  Because of Circu's abilities, remove two cards from the top of your opponent's library from the game.  For the rest of the game, he or she can't play cards with those name (the two Circu removes, not the Glimpse).  Next turn cast Recoil, then Dimir Infiltrator, then Sleeper's Robe, then Lim-Dûl’s Vault, then Hibernation Sliver, then Spatial Binding, then Diabolic Vision and finally.. for the finale, CAVERN HARPY.  Before you know it, your opponent won't be able to play ANY spells.  Side Note: Cavern Harpy + Aluren + Circu = your opponent concedes.  You can now too say "MWAHAHA". Combo submitted by Lionden_56.

In other news, if you don't feel like casting Circu... just Twincast Glimpse the Unthinkable... 20 cards for UUUB isn't bad at all!

Perilous Forays - Seed the Land 
Wouldn't it be nice to always draw a nonland card from the top of the deck, but yet still have enough lands to cast your spells?  Well, this two card combo will allow you to do that.  With both cards in play a land.  Seed the Land will generate a 1/1 snake token.  Pay one to sacrifice the token (and pay one) to the Forays and search your land with a basic land type and put it into play tapped.  That triggers Seed the Land again and repeat this as many times as you have mana open.  You may need a few turns, but before you know it, your library will be landless and every card you draw will be a spell (not to mention you will have access to your entire fleet of lands in play).  Add Stone-Seeder Hierophant for more fun.
Light of Sanction - Hammerfist Giant 
I found this combo over on Derick's Magic Site and thus, many thanks to his combo listings there - I have incorporated some of the ideas there into combos already on this page.  

Everyone thought that Light of Sanction was a waste of a card.  Well, not really if you like the ability on Hammerfist Giant.  It's a shame the giant's ability kills itself too.  So, to keep your Hammerfist Loaf in play after his ability resolves, just have light of sanction in play.  All damage it would have dealt to itself and creature you control ... is prevented.  I'm liking Crater Hellion a little more. 

Can you believe Light of Sanction even combos with Sorrow's Path??

Ulasht, the Hate Seed - Cloudstone Curio
Here's a fun combo for you. Make sure Cloudstone Curio is in play.  Cast Ulasht.    Spend some mana removing +1/+1 counters from Ulasht and create a bunch of tokens.  With the last token, use Curio's ability to return Ulasht to your hand.  Then, next turn, cast Ulasht again and get almost double the counters on him you had last time and create more tokens or deal some damage.  This combo was submitted by several people.
Djinn Illuminatus - Glimpse the Unthinkable or Lava spike...
Oooooh....  UUUUUUBBBBBB = target player puts the top sixty cards of his or her library into his or her graveyard.  At least, that's what this two card combination can do for you.  With Illuminatus, Glimpse of the Unthinkable can be replicated for UB meaning for each UB you pay, your opponent loses 10 cards in his or her library.  It will take you a while to get the Djinn in play, but at that point in the game you probably only have to spend UUUBBB to rid your opponent of his or her library.  Maybe UUUUBBBB.   For more fun with the Djinn, try Lava Spike or Lightning Bolt.  Or, find those fun cards that only cost one and draw you a card.  Those work terribly well with the Djinn.
Sky Hussar - Kiki-Jiki, Mirror Breaker 
WOOT!  Infinite creatures in Standard (at least until Kamigawa phases out).  How does this work?    With both cards in play, tap Kiki-Jiki to copy Sky Hussar.  When the new Sky Hussar comes into play, untap all creatures you control (including Kiki-Jiki).  Now, make another copy of Sky Hussar and repeat to infinity.  What are you going to do with all of these creatures?  I don't know, maybe attack since they all have haste thanks to Jiki!  This combo was submitted by various people both in the forum and via email.
Searing Meditation - Firemane Angel or Angel's Feather 
For any card that can gain you life on a consistent basis, and then add Searing Meditation.  Firemane Angel and Angel's Feather are both cards that will be available in type two play.  Then, when the 'whatever card you choose' gains you life, pay 2.  Then scorch target 'target'.  If you want more fun with Firemane Angel and don't mind dipping into the Extended card pool, add Thran Turbine if you're using Firemane Angel.  At the beginning of your upkeep you can add 2 mana to your mana pool to pay for the Searing Meditation ability that your Firemane Angel activates (as long as she is in play or in your graveyard). A three life swing (up one for you and down two for your opponent) isn't bad.. especially when it's free thanks to the Thran Turbine.   Submitted by Teradonus.  Another source in Ravnica that can net you life gain each turn (potentially) is Dark Heart of the Wood.
Dark Confidant - Sensei's Divining Top 
This combo was submitted by both KillRoy and Devouring Zombie. Expect to see Bob Maher's card (Dark Confidant) adorned with the divining top for the next year.  The Confidant is very 'black' in flavor and thus is very risky if you don't have some control over his ability. Say you have a Kuro Pitlord or some other expensive card that's your next draw.. you are going to lose a lot of life if the Confidant's ability draws it.  However, if you have Sensei's Divining Top in play, just 1 colorless mana can prevent a large amount damage just by rearranging the top 3 cards of your library.  Prevent isn't the right word, but you get what I mean, right?
Plague Boiler - Loxodon Hierarch 
This combo was submitted by several people.  Plague Boiler is this sets Nevinyrral's Disk.   And with come the opportunities of combos.  We aren't talking Symbiotic Wurms or Rukh Eggs here.. we are talking board advantage of a grander scale.  With the Hierarch in play, and when the boiler 'explodes', you can regenerate each of your creatures for a measly WG and a sacrifice of one creature - the Hierarch.
Storm Herd - Sins of the Past 
While this combo was originally posted by MaGo, I wasn't going to post it at all.  That is, until someone actually made a deck around the combo.  The combo, simply put, is play a 10 mana card for six.  Assuming you have 16 life or something, you get 16 1/1 white Pegasus creature tokens with flying... for six mana.  Fun?  Yes.  I'm still amazed someone actually built a decent deck around it.  Go them!
Leyline of Singularity - Empress Galina 
This combo was submitted by Cabal Patriarch & Shabbaman in the forums and they recommend enchanting the Empress with Lightning Greaves.  Moving along, to put this combo simply, with both cards in play the Empress translates into: UU, T: Gain control of target nonland permanent.  Sounds fun, especially if you can open up with Leyline in play at the beginning of the game.  Makes it easier to focus on getting the Empress in play faster. 

Other cards that are fun with the Leyline include: Arena of the Ancients, Blind with Anger, Karakas, Konda's Banner, Hero's Demise , Loyal Retainers, Sword of the Chosen, Vassal's Duty, Day of Destiny and Tsabo Tavoc. That's just a few of the more fun ones.

Abyssal Nocturnus - Unnerve 
This multiplayer combo was submitted by PerfectCell in the forums.   Say you are playing in a 4 person game.  You have the Horror in play and play Unnerve.  Each of your opponents discard two cards and the Nocturnus gets +12/12 and fear until end of turn.  That's it... a big nasty Horror staring down each of your opponents while you decide to attack one of them.  Sounds like a nice multiplayer (group) combo to me.  Note: The decklink to the left doesn't use Unnerve, but instead uses many other popular discard cards to boost up your nocturnus.
Killer Instinct - Congregation at Dawn and/or *Top
Search your library for any three creature cards and put them on top of your library... in any order and for only three mana - Congregation at Dawn seems cool enough.  To make full use of the Dawn, make sure you have Killer Instinct in play (and I'm talking about the card).  That way, during you next upkeep the card that you stacked on top of your deck is thrown into play to attack for a turn and then die.  Crater Hellion anyone?  Now remember that to stack the 3 creatures on top of your deck wisely.. the second one will be drawn and the third one will be thwarted into play the next turn thanks to Killer Instinct. 

Note: Sensei's Diving Top works VERY well with Killer Instinct.

Ghost Council of Orzhova - Debtor's Knell 
Long live the Orzhov!  Seriously, though.  These two cards make a deadly combo and even more deadly with the Dragon Legends from the Kamigawa block.  Your sacrifice a Dragon with the Council and then next turn, bring it back into play with the Knell.  Sounds pretty nasty to me.  Plus, I have a deck for it!  Check it out!!! 
Evolution Vat - Triskelion 
Sorry guys, I just had to include Triskelion on this combo page somehow.  Triskelion doesn't need to tap to remove a +1/+1 counter to deal damage with it's ability.  And thus, tapping it via the Evolution Vat doesn't really restrict Triskelion aside from not being able to block or attack (unless of course you use this ability after the combat phase). Pay 2UG a few times before the end of the turn and double the counters on Triskelion.  Before you know it you will be able to pick off your opponent's army with Triskelion or kill an opponent. 
Desperate Ritual - Lava Spike - Izzet Guildmage
I can't believe WotC printed an infinite combo as easy as this in Standard. How does it work? Simple. Play Lava Spike. Splice Desperate Ritual onto it for 1R (adding 3 mana to your mana pool). Now, activate Izzet Guildmage's ability with the three mana that Desperate Ritual produced to copy Lava Spike with Desperate Ritual Spiced onto it. Keep using the 3 mana from Desperate Ritual to use the Guildmage... and you've done infinite damage to your opponent's head. Good deal. There are already many decks in the works to exploit this threesome of cards.
Pillory of the Sleepless - Sleeper Agent 
This combo was submitted by Conman in the forums. How mean is it to give your opponent a 3/3 creature?  Not mean at all.  However, during their upkeep if they are losing 3 life a turn and can't attack or block with it, that is mean.  Just beware Carrion Feeder.  The point: Play the Agent and then enchant it with Pillory.  If they can't sacrifice it, they are stuck with a 6-7 turn clock before shaking your hand and saying 'good game' (if they have any sense of sportsmanship).
Transguild Courier - Blessing/Might of the Nephilim or Coalition Victory 
Get the most out of your 'of the Nephilim' cards from Dissension and cast it either on a Nephilim, a Sliver Queen... or Transguild Courier (the cheaper of all other options).  In the case of Blessing of the Nephilim, the Courier would get +5/+5 for just one white mana.  Might of the Nephilim gives the Courier a whopping +10/+10!!! Where's the trample lovin'?  This combo was submitted by YWN.

According to Adrian, Govern the Guildless's Forecast ability works very nicely with the 'of the Nephilim' cards.

Let's also not forget about Coalition Victory.  Transguild Courier satisfies the requirement for having a creature of each color.  Getting a land of each basic land type should be easy.

Leyline of Singularity - Hunted Creatures 
Here's yet another way to maximize the efficiency of the hunted creatures from Ravnica.  With Leyline of Singularity, all of the tokens created by the Hunted creature have the same name and thus are all destroyed because of the Legend.  With this in mind (and with is applying to all by one of the hunted creatures) you get a nice creature for a cheap cost.  Once all of the tokens come into play, they die.  That's not bad.

Note: This Leyline works well with Sword of the Chosen, Kashi-Tribe Elite, Hero's Demise, Kitsune Healer, Yomiji, Who Bars the Way and/or Minamo, School at Water's Edge

Ghostway - Wrath of God 
Hey!  Look!  It's a mono-white combo that costs 4WWW total which is ultimately 2 mana less than plague wind (thumbnailed to the right for easy reference) but does almost the same thing -- destroy all of your opponents' creatures.  Plus, with this two card white combo you get comes into play effect to boot (at the end of turn)!  I think you can figure it out.  And note: Ghostway combos with LOTS of other cards.  I'm just too lazy to post them all.
Leyline of the Void - Bloodbond March 
This combo was submitted by GRUNT in the forums. Finally!  A card to make Bloodbond March really worth casting.  Leyline of the Void will prevent your opponent from having cards hit the graveyard and stay there.  Thus making Bloodbond March optimal for you.  Whenever your opponent casts a creature card, it's more likely that they don't have any like-named creatures in their graveyard (thanks to the Leyline) and thus won't reap the benefits of the March.  However, when you cast a creature spell, you get the full effect of the March thanks to Leyline.  Nice.
Hatching Plans - Auratog or Claws of Gix

Anything that let's you sacrifice an enchantment goes well with Hatching Plans.  There are specifically three creatures that do this well: Auratog, Phantatog and Thaumatog.  Auratog is the best of the bunch since it gets +2/+2 until end of turn whenever you do this.    If Atogs aren't your favorite creatuer type, try Claws of Gix... sacrificing a permanent was never more fun.  The deck link to the left using Claws of Gix with Hatching Plans.

Note: Crack the Earth also has some nice synergy with the Plans card.  Your opponent sacrifice a permanent and you sacrifice a permanent netting you 3 cards.  Not bad.  Thank Xander & CarrollN in the forums for that one.

Ink-Treader Nephilim - Cantrip Spells! or Electrolyze or...
Ink-Treader is like the mutant creature version of Radiate.  Whenever you target it with an instant or sorcery that only targets it, copy it for each other creature that spell could target.  Cards like Aether Mutation are cool and all, but why not net some serious card advantage?  Try any 'cantrip' spell.  There first one that came to mind was Aggressive Urge from Invasion.  It like Collective Unconscious on steroids for only two mana.  If you want to do the same, but deal simulate a Pyroclasm at the same time (note the Nephilim is a 3/3), try Electrolyze.  Not only is it standard, but it fits in with the colors of the Nephilim.

For those of you that don't know, a cantrip is any spell that has a small effect (usually) that also nets you a card.  Some other examples of cards that would work here include:

WHITE: Formation, Guided Strike, Lightning Blow, Shelter (not optimal unless you control every creature), Spiritualize and Withstand. BLUE: Leap, Quickchange, Shadow Rift, Touch of Invisibility and Updraft (worse than Leap!). BLACK: Afflict, Fevered Strength, Gravebind and Ribbons of Night (interesting choice). RED: Accelerate, Boiling Blood, Chaotic Strike, Ember Shot (not recommended... at all!), Flare, Panic, Stun and Zap. GREEN: Feral Instinct (the worse aggressive urge), Reality Anchor, Refresh, Sudden Strength, Touch of Vitae and Wildsize. GOLD: Fire/Ice

Mind you, these are the only uses for the Nephilim.  You could Boomerang your own Nephilim for a simulated Evacuation.  You could Last Gasp your Nephilim to creature a weenie wrath of god for all 3/3's and less.  You could even use Gigadrowse to tap down the boards.  This guy is combo-licious (perhaps I should have just written an article on this...)

Genju of the Cedars - Beastmaster's Magemark - Earth Surge 
This is a strange but cool combo.  You see, if you enchant a Forest with Genju of the Cedars, and then enchant it with Beastmaster's Magemark and also have a Earth Surge - the end result is a 7/7 creature that gets +1/+1 until end of turn for each creature that blocks it.  For fun, throw in a Genju of the Spires, a mountain and a Fencer's Magemark and it becomes a 8/8 first-striking creature with the aforementioned ability.  Kind of involved, but kinda very cool.  And I have a deck in the database for it! 
Sky Swallower - Brand or Stifle
This is best combo for Sky Swallower considering the mana cost of brand.  Ghostway is nice but you are effectively adding 3 more mana to the cost of the Leviathan and thus, making it an even 8 mana for a 8/8 flyer.  That's not so efficient in my eyes.  How it works?  Taps 6 laps to get at least 1 red and 2 blue mana.  Now play the Sky Swallower and give your opponent all of your permanents.  After that resolves, play Brand.  Say hello to your permanents again (assuming they were all yours to start).  In conclusion, you get all of your permanents and an 8/8 flying leviathan for only 6 mana total.  Note: I just realized Stifle will do the same thing for a color blue mana (sort of).  OK.. so use Brand or Stifle with the Sky Swallower.  That's it...
Debtor's Knell - Wrath of God 
Debtor's Knell + Wrath of God = Great Recursion and even better in a multiplayer game.  Debtor's Knell was rated #1 multiplayer card by Anthony Alongi & Bennie Smith in the latest issue of Scrye.  And no wonder - you can grab creature cards from ANY graveyard and put them into play under your control.  Wrath of God is just a great way to facilitate the use of the card.  Several of your opponents have great creatures on the board?  Wrath of God them.  Then, each turn, take one by one from a graveyard to your playing field.  That's mean.  That's cruel.  That's a probably win for you.  That's good.  Note: You could always team up Debtor's Knell with Ghost Council of Orzhova to make an unkillable Ghost Council.
Bronze Bombshell - Spawnbroker 
Oooh... it's a toned down walking version of Booby Trap that's easier to set off than the original.  Does anyone find it funny that the bombshell is a female?  Perhaps WotC is paying homage to the original "BOOBY" trap.  Anyway, all you have to do is make sure you don't control it to set it off.  There are many ways to accomplish this (like Sky Swallower, Donate, Avarice Totem, Legerdemain and Endless Whispers) but I like Spawnbroker the best.  Just exchange bombshell with one of your opponent's best creatures and watch them take 7 to the head.  This combo was submitted by Zealot in the forums.  The deck link uses Bombshell with Sky Swallower.
Simic Guildmage - Bramble Elemental 
Ah... the new Simic guildmage.  This is one of my favorite of the guildmages mainly because you can move around Auras - I've always loved Enchantment Alternation!  About this combo - Any time you move an Aura from the Bramble Elemental to another creature and then back to the Elemental, it's ability activates putting two 1/1 green Saproling tokens into play.  Note that the Aura has to be moved off of the elemental and then back onto it for the ability to trigger.  This combo was submitted by several people in the forum and via email.
Celestial Ancient - Shimmering Wings or Flickering Ward... 
This combo uses the same concept as Verduran Enchantress and bounce enchantments(auras) like Shimmering Wings and Flickering Ward.  With Celestial Ancient in play you can cast Shimmering Wings to put +1/+1 counter on each creature you control and then bounce it to your hand.  Basically it equates to "UU: Put a +1/+1 counter on each creature you control.".  Or for Flickering Ward: "WW: Put a +1/+1 counter on each creature you control." Not bad. 

Other cards that could replace Wings include Cage of Hands, Crown of Flames, Crown of Mourning, Natural Emergence, Shackles and Whip Silk.  There are, of course, more.  This combo was partially submitted by YWN.

Psychic Possession - Solitary Confinement or Skyscribing 
When I first read Psychic Possession, I thought to myself, 'Huh?' and 'What good is this card?'  However, it lets you technically replace your draw step (should you have a card that skips it) with a new draw step that happens during your opponent's turn so that whenever they draw a card, you do too.  Then I realized, Solitary Confinement works wonders with Psychic Possession.  It create a sort of unstoppable lockdown as long as your opponent is drawing cards. 

Then there are cards like Vision Skeins and Skyscribing that will net you double the cards when casting (since you get to draw three cards and then you draw another three cards because your opponent is drawing too). Note: Prosperity works the same as Skyscribing but costs one less mana. 

Also, Teferi's Puzzlebox is a nice little card for Psychic Possession ... I'll let you figure that one out on your own.

Ghost Quarter - Shadow of Doubt or Darksteel Citadel 
Ghost Quarter... certainly not the new Strip Mine by any means, but it definitely has some combo potential.  If you activate the Quarter's ability on an opponent's land and then cast Shadow of Doubt,  your opponent will just lose the land and not be able to search for a new one.  If you use Quarter on a land you control, like Darksteel Citadel, you don't lose a land and still get to search your library for a basic land card and put it into play.  This combo was submitted by YWN & retarded_a_i.

Note: Crucible of Worlds works well with just Ghost Quarter too.

 
Simic Ragworm - Opposition or Ocular Halo or...
It's the green Horseshoe Crab!!!  And it's a lot uglier too.  Oh.. wow!  And it's a "WORM", not a "WURM".  Hmmm, since when did they bring back worms? In Green?

With Simic Ragworm, like it's blue predecessor, you make maximize any enchantment (or aura) that involves a tap and an effect.  With Ocular Halo, you can Draw a card for each blue mana you spend.  With Opposition, you can tap an opponent's board for each blue mana you spend.  With Glare of Subdual for you block lovers out there, you can tap an opponent's army and/or artifact horde for each blue mana.

I'd prefer to use a card like Hypervolt Grasp, Arcane Teachings or Viridian Longbow with the Ragworm, but I like damage.  If you like control, go with Opposition or Glare of Subdual!  This combo was partially submitted by YWN & Maleficent in the forum.

Rakdos Guildmage - Skyshroud Elf - Mana Echoes 
These three cards can net you infinite creatures (and mana) and here's how: With at least three goblins in play, the guildmage and the elf, use the guildmage's ability to generate a goblin token for 3R.  Thanks to Mana Echoes, add 4 mana to your mana pool.  Convert at least one of that colorless mana into a red mana thanks to the Elf.  Keep repeating... each time you repeat this you get one more mana (and one more creature).  The next one will be 5 mana from the echoes, then 6, then 7, etc.  Luckily all of these goblins have haste so be sure to attack for infinite damage too!  
Tidespout Tyrant - Ornithopter - Angelic Chorus 
Infinite Life -- how does it work?  You will need Ornithopters to make this work with one in hand and one in play.  Also, you will need to have Tidespout and Chorus in play.  Now.. cast Ornithopter for zero mana.  Tidespout triggers so you return the Ornithopter already in play to your hand.  Chorus also triggers gaining you two life.  Play the Ornithopter now in your hand and do like you did before.  Before you know it infinite life is yours! This combo was submitted by YWN in the forums.
Curiosity - Niv-Mizzet, the Firemind
I had to post this in fear of getting 3000 emails about the same combo.  Many people have already submitted it via email and in the forum.  OK.  This is simple.  Enchant Niv-Mizzet with Curiosity.  Now, tap Niv-Mizzet to draw a card.   Niv-Mizzet deals 1 damage to target creature or player (preferably an opponent). Curiosity activates again, drawing you a card and thus dealing another point of damage - dealing up to infinite damage to an opponent.  Well, infinite in terms of as many cards are in your library infinite.  Thanks to everyone that submitted it.

Also note that there are many cards that work well with Niv-Mizzet.  Some cards that come quickly to mind include Invoke the Firemind, Greater Good and Mindmoil.  Have fun!  (Necrologia is also an interesting idea thanks to retarded_a_i in the forums.)

Izzet Guildmage - Reset 
Yes, I know - most of you don't own a Reset.  However, you can still imagine how fun this combo is (for the person playing it).  The unfortunate thing about Reset is that you can only play it during your opponent's turn - but I'm sure you can use your creative mind to figure out a kill using it.  The Izzet Guildmage let's you copy instants and sorceries.  That's great.   For five mana, play the reset and then copy it with the Guildmage.  Let the copy resolve to untap all of your lands.  Then, copy the original Reset and you have two mana to spare.  With more lands you can generate more many faster.  Ultimately, you will net infinite mana.
Sprouting Phytohydra - Æther Flash - Kaysa 
This combo isn't exactly Standard legal, but it's still fun.  How it works?  First you will need a means to up the toughness of your creatures by at least one point.  Kaysa does this nicely (as it really only has to be for your green creatures like the Phytohydra).  Once you have that sorted out, have it in play along with Æther Flash.  Now cast Sprouting Phytohydra.  Flash deals 2 damage to it and it's ability triggers copying the Hydra. The new hydra triggers Æther Flash and the cycle repeats and so on.  Before you know it, you'll have infinite creatures.  Defender creatures, but still infinite creatures.  Biomantic Mastery anyone? 

You will need to find a means to stop the infinite loop by either removing your toughness upper card or your Flash enchantment.  If you don't, it will be a loop you cannot stop and thus the game will be a draw.

Tidespout Tyrant - Pandemonium - Emerald Medallion - Quirion Sentinel 
Infinite damage - how does it work?  With Tyrant, Pandemonium, one Sentinel and Medallion in play and one Sentinel in hand, cast the Sentinel.  Note it will only cost you one mana thanks to the Medallion.  When he comes into play return the other Sentinel to your hand (because of the Tyrant) and add one green mana to your mana pool.  Play that Sentinel and repeat for infinite damage thanks to Pandemonium.  Each time the Sentinel comes into play, it deals 2 damage to a target.  Repeated Cavern Harpy style a billion times equals a billion times two damage (the Sentinel is 2/1).
War's Toll - Rhystic Lightning or Rhystic cards in general 
The Rhystic cards from Prophesy were bad cards.  They allowed your opponent to pay mana to prevent you from maximizing certain spells.  However, if you combine them with a card like War's Toll, they will have to think twice about paying that extra mana to prevent you from playing the full effect of a Rhystic spell. If they do they will become tapped out for the rest of the turn.

Also, cards which give upkeep costs to permanents your opponents control, like Tabernacle of Pendrell Vale, also work towards the cause of locking up your opponent's lands with War's Toll.

Note: Hissing Miasma also works nice with the second ability on War's Toll.  Nettling Curse also works well with War's Toll.

Rakdos Pit Dragon - Land's Edge or Putrid Imp
Just looking for more interesting ways to discard your hand, aside from One with Nothing...  While Amok works best with the Pit Dragon, Land's Edge is another nice red card that can discard a card without having to pay anything and even can deal damage if it was a land.  Then there's the Rakdos wanna-be Putrid Imp that can also rid your hand of cards quickly and easily (without having to invest mana into discarding them).   Mind Over Matter anyone?
Fertile Imagination - Upheaval 
While I prefer Blood Oath to Fertile Imagination, this combo still works except instead of damage you get 1/1 green Saproling tokens. Upheaval to return all permanents to their owners' hands with mana floating and then cast Fertile Imagination.  Choose lands or whatever card type your opponent had the most of.  And walla!  Lots of Saproling Tokens!  This combo was submitted by Mad Mat in the forums.  Note: Cards like Evacuation, Reduce to Dreams and Sunder all have similar combo/synergy potential with Fertile Imagination.
Ratcatcher - Conspiracy 
Ratcatcher is a unique black creature as it can fetch any Rat in your deck during your upkeep each turn.  What if every creature in your deck was a Rat?  What if it didn't matter if the REAL cards were rats?  Well, Conspiracy does the job.  All of a sudden, even the Ogre, Demon and Thrulls in your deck can be fetched by Conspiracy as long as you set Conspiracy to Rat.  This combo was submitted by YWN.
Anthem of Rakdos - Urza's Armor 
There isn't anything terribly difficult about this pair of cards.  Urza's Armor prevents the one damage that Anthem would deal to you for each creature you attack with. This combo was submitted in the MDV forum by Your Worst Nightmare (YWN). 

Also, Tresserhorn suggests using One with Nothing as a means to empty your hand quickly for a surprise double-striking band of creatures.

Vigean Intuition - Congregation at Dawn 
This is an expensive combo but it can be like casting three Worldly Tutors and then drawing three cards.  Cast Congregation at Dawn and put three creatures of your choice on top of your library in any order.  Then cast Vigean Intuition and put those cards into your hand.  Mind you that you need to choose 'creature' when casting Vigean Intuition to make this work.  If you are lucky, your card under the top three creatures will be a creature too... 
Azorius Æthermage - Trade Routes or Meloku... 

How many cards return cards to your hand?  I don't know but there are lots, but there are at least a few that can do it on a consistent basis.  Cards like Trade Routes and Meloku the Clouded Mirror can do it multiple times in a turn depending on the number of lands you have in play.  Just pay 1 mana whenever you return something to your hand and draw a card.  Do this multiple times in a turn and you will see yourself drawing many-a-card per turn.

Other cards that can do it for you once a turn include (from Standard) Blood Clock, Skull Collector, Trusted Advisor and even the common guild lands from the Ravnica block! Partially submitted by YWN.

Guardian of the Guildpact - Darkest Hour or Shifting Sky 
Here's a combo that will be so popular, it will take over extended! !!! ... Not really.  However, if you can make all creatures one color via Darkest Hour or Shifting Sky, your guardian suddenly becomes unblockable.  Exciting, right? Not really.. but it's technically a combo.  Hmmph.
Souls of the Faultless - Entangler 
This combo was submitted by Planeswalker in the forums.  Enchant the Faultless Souls with Entangler and watch your opponent not want to attack you.  Of course, you'll want to give Souls of the Faultless flying and an 'activatable' shadow ability to be perfect.  But, should your opponent attack with even one creature the defender could block, they will be taking as much damage as the creature they attacked with can deal. Not bad for a casual deck.  How often do you people really use Entangler anyway?  Time to dust off an uncommon from the Masques block. *grin*
Hissing Miasma - Fumiko the Lowblood 
Fumiko... I was never a big ran of this creature as I feel it is a wasted rare.  However, with Hissing Miasma and something like Worship (or any other card that can negate the attackers from killing you).. you have a casual deck idea with the guy.  If all of your opponent's creatures have to attack you they lose 1 life for each creature that attacks thanks to the Miasma.  This combo was submitted by 'Your Worst Nightmare' in the forums. 
Graven Dominator - Yamabushi's Storm or Night of Soul's Betrayal