I like the idea but I think some of the cards are unnecessary. -1 Blade of Bloodchief( Three is enough) - 4 Vampire Lacerator(Pointless sacrifice) + 4 Vampire Hexmages(For the Blade and Kalastria Trigger) - 4 Bloodthrone Vampires + 4 Gatekeepers of Malakir( To trigger your own Bloodghast and Kalastria) +3 Pawn of Ulamog (You get the picture)
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Seem like a cool deck to me!
I would switch out for lightning bolt, doom blade for terminates, and furor of the bitten for blightning.