Modern G/W/B

I like the low mana curve, especially when playing Dark Confidant. 

It's still risky to me, though, as you'd be committed to losing up to three life each turn (and that's with only one Dark Confidant on the board). If D.C. comes in on T2, you suddenly are racing not only your opponent, but your own library to finish the game.  Then again, there's a reason D.C. carries that price tag.