It looks like a T2 deck, however, Cultivate is not a T2 spell.
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Oh, and double lands like darkslick Shores/Drowned Catacombs.
Right now, it's Extended and not standard, Assuming you want it to be standard you'll need to drop Liliana Vess and Wall of Frost. Other than that, Necrogen Censer is not good if not build around, I'd loose it as well. also, you want to proliferate a bit, so you'll need alot of mana. Try adding a land or 3. Too bad Everflowing Chalice is no longer standard. Another consideration is because you proliferate so much, you could go with an infect creature as well, Inkmoth Nexus is quite good in that slot, or a Skitheryx perhaps.