Hey bud, like the deck, here's a few ideas. See if they work or not. I think they restricted Voltaic Key. Yawgmoth's Bargain is obviously just an expansive Necropotence but there is no harm in throwing one of those in there as well. I'm also concerned about your ability to produce blue, even though you have limited blue in the deck. I would add a Vampiric Tutor and Lim-Dul's Vaults to the mix. Get a little more blue mana in and you'll have good card management for your slightly larger deck size.
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I'll have to look up a lot of the cards. I'm not familiar with most of the newer sets. I guess I play mostly what they call Vintage now. If you guys want to see an interesting deck you should check out my damage control deck. Most people think they are playing against a white weenie deck at first until they realize it's actually control. It's a fun surprise.