I would not keep Falkenrath Aristocrat in this deck because you wouldn't be able to use all the cards activated abilities to your advantage, plus while her sacrificing ability utilizes some of the abilities on your creatures and enchantments, you would be better off with vampire aristocrat since he would get +2/+2 until end of turn with each sacrificed creature.
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black exile spells.. 'nuff said
i have a obliterator deck that would take care of the creatures pretty quickly, but i like the build :)