I would take out smallpox, zombie infestation, and maybe sorin's thirst for go for the throats, more cemetery reapers perhaps, and some of those 1B discard a card cards.
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Forget what I said about doubling chant, I was thinking it did something else.
http://www.mtgvault.com/ViewDeck.aspx?DeckID=206762 I would use that as a starting point :) Random advice though, Doubling chant PROBABLY isn't worth it if it only combos with one other card in your deck, you NEED swiftfoot boots or you'll have a 20/20 trample primordial hydra just get doombladed. The haste is just a bonus. Fog?
I'm not completely sure why you have Inkmoth Nexus in the deck as none of your other creatures have infect. If you want a land that you can turn into a creature (hard to remove) I would go with Dread Statuary instead.
Instead of Consuming Vapors I would go with Go For The Throat. I don't really see why you have Batterskull in there. Take a look at Corrupted Resolve and Blighted Agent, I think they would both fit pretty well.