Try adding prowler's helm for your master of cruelties. There's only about 5 cards in standard that can block him then.
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Nice deck. You could put in Lingering Souls instead of Spectral Possession if you wanted to keep it a standard deck.
You may want to change the general to Momir Vig. He adds a ton of control to your deck. I've used him as a general myself and he's insane.