Monoblack Vampires

Any thoughts? This is aggro focused. If I can get more of the black fetch lands I plan to swap out the Swamps with them to help draw a black card on top for Vampire Nocturnus.

Creatures
4 Vampire Nocturnus
4 Vampire Nighthawk
2 Malakir Bloodwitch (2 main, 2 SB if I face too much white)
4 Gatekeeper of Malakir
4 Bloodghast
4 Vampire Lacerator
2 Vampire Hexmage (2 main for the curve and first strike, 2 more if I face too many quests or Planeswalkers)

Spells
2 Quest for the Gravelord (to use against sweepers)
2 Duress
4 Sign in Blood (prevent the stall)
4 Doom Blade (torn between this and Hideous end, but went for this due to lower CMC)

Lands
24 Swamp (Swap out for fetchlands as I get them)

Sideboard
2 Malakir Bloodwitch
2 Feast of Blood (Extra removal if needed)
3 Marsh Casualties (Clearing)
2 Black Knight (Against white)
2 Vampire Hexmage
2 Deathmark
2 Tendrils of Corruption

-2 duress +2 bloodchief ascension, the card is silly good
-1 swamp +1 quest for the grave lord, your aggro not control. might even be able to go 22 lands with all the 1 drops
-1 gatekeeper +1 hexmage, looking at gatekeeper when opp has nothing you want them to sac makes him a bear in hand
-1 sign in blood +1 feast of blood, only really need 3 anf feast hits any creature
-1 doom blade +1 feast of blood, black is getting real popular

Hmm, I may have to trade for more Ascension then. I only have that 1 Japanese one from you.

I'll try out the quest and feast though if I have time to tweak my deck tonight before I play.