So, it looks like there's a tie:
Black Lotus (2): The most expensive card in the game at at LEAST $300, we can see why it's priced so prohibitively. This has more first turn kill combo potential than any other card.
Mountain+Black Lotus (Green)+Channel+Fireball+Mox Pearl+Healing Salve
Raging Goblin+Black Lotus(Black)+Swamp+Hatred+Mox Jet
Necropotence (2): Pay 1 life, draw a card (at discard phase), discards are RFG, and it's got a defense v. harakiri (skip your draw phase.) Ye God.
Ivory Tower+Necro=Scoop.
Necro+Transcendence+Forsaken Wastes=Game
Necro+Any life gainers=Open library=Game
In the immortal words of Istanbul, "this card isn't broken, it's shattered into tiny pieces, and then those pieces are shattered into smaller pieces."
And now those pieces are going to be liquified.
One moment please
(Gets extra WUBRG ready)
Ahem, that was refreshing. Now let's begin.
Ready,
Aim,
FIRE!
http://www.johnavon.com/PICS/2_CARD_PICS/Apocalypse/lego.jpg
http://wizardworld.com/dbimages/MG/MG1000/MG21772.jpg
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============= 2 mana of every color
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http://wizardworld.com/dbimages/MG/MG1005/MG23565.jpg
http://www.gensuikin.org/panel/1-1.jpg
Thanx Johnavon.com, wizardworld.com, and gensuikin.com for the pix
Next topic: Annoying come-into-play abilities.