Oh my god I LOVE IT! Sick, twisted, mad....YAY.
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You desperatly need Gemhide Sliver. If you like you can take a look at my Sliver deck although its already outdated.
Sokunokumi
I'm sorry. I can't see anything special or interesting in this deck. I think it's too expensive while having too less land. And get rid of dark banishing and put more terror in it. Same effect but terror is cheaper.
Just an idea: Hokori, Dust Drinker + Nature's Will?
The deck had 4 Terror in the earlier versions. I removed them due to the multicolor nature of the Alara Block. I decided to put 4 Unmake instead of terrors in it. This time mana has been the biggest problem. So I decided to neglect the instants and go with creatures that had persist, get them back from the graveyard or getting the creatures from my opponents. Maybe I'm putting in Cauldron of souls again which can also be used for aggressive purposes (at least in this special deck xD) I'm thinking about your land hint. Maybe I'll sacrifice 2 cards for lands although I have always been lucky regarding the mana.