Black for Victimize maybe? It would allow for things like Putrefy and Doom Blade as well... There's also something to be said for blue - Renegade Doppelganger is one...
Permalink
It looks like a very good deck overall - maybe playing Inquisition of Kozilek over Duress and Megrim over Diabolic Tutor would be the only changes I would make.
Very creature-based for a creature-light deck...
That could actually work with a Coat of Arms or two, maybe a Door of Destiny...
Wait...is that a Volcanic Hammer I see!? Is there seriously nothing better to play?
How about Quest for the Pure Flame? It gets a quest counter every time an opponent taps a land for mana with Manabarbs in play, and circumvents the problems caused by Furnace of Rath: Say you have a fully charged quest in play with four lands. If your opponent now plays a spell with four lands, you can float four mana in reaction to the Barbs resolving on them, take four, pop the quest, they take eight, and they are now open to a lethal hit from a few doubled Lightning Bolts...
161-166 of 166 items