Did you think about reassembling skeletons? you can pay 1B and get them from your graveyard, good blockers if you need some time.
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Also, spellbook is cool, but unless you get mana screwed you really don't need a bigger hand. but it is up to you sir.
I would add some Gatekeeper of Malakir. It costs BB and is a 2/2. if you kick it, for one B your opponent sacrifices a creature. It is good for getting rid of there defenses, specially in the early game. I would personally switch Guul Draz Vampire with Ruthless Cullblade. it costs one more and has the same ability, except it is a 2/1. Tendrils of Corruption is alright, but I highly Recommend Corrupt(5B), it deals damage directly to your opponent and heals you for how ever many swamps you have. it is a mid-late game card though, but it is a great tool if you are going up against a late-game deck. Keep the Blood Seekers it will make your opponent not want to summon a creature, specially if they think you can destroy it easily. if you don't want Tendrils of Corruption or Corrupt, think about Quag Sickness, it costs 4B and gives a -1/-1 counter to creature for every swamp. Or Grasp of Darkness for 1B it gives creature -4/-4. if you can, try to put in a couple of Kalastria Highborn(BB). A 2/2 where if a vampire goes into the graveyard pay B and taget player loses 2 life and you gain 2. pretty good if all you have is vampires. haha. I would also personally take out the Hexmages, unless you end up going against an infect deck or get counters on your creatures a lot, there ability is to expensive...unless you know, you combo it with Kalastria ;) yet if you want a combo like that then get Aristocrat Vampire/ Bloodthrone Vampire. they are both 1/1's and get +2/+2 with a sac. and if you can get your hands on it, Captivating Vampire is GREAT, give all other vamps you control +1/+1. and you can tap 5 vamps and take control of target creature..and it also becomes a vamp, muahahaha! (you can buy a vampire deck for $20 with captivating vampire in it also. along with others I mentioned.) Quest for Gravelord would be iffy, you have sac abilities so you would be able to get your 5/5 zombie. except then you'd have a zombie. haha. well I hope it helps or maybe gave you some Ideas that work even if they have nothing to do with the cards I suggest haha. Yet if you could so kindly maybe help me with a graveyard deck I am working on that would be great! http://www.mtgvault.com/ViewDeck.aspx?DeckID=162725