Welp, 4 Hellriders now lol.
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I don't like that it says the deck has green in it, just because of Armed//Dangerous. Obviously I don't use the Dangerous half.
Some cards you may want to look at are Captivating Vampire, Shadow Alley Denizen, Bloodline Keeper, Feast of Blood, and Urge to Feed. All of these are great additions to any vampire deck, and even better if its mono black. If you notice, they all work really well together too :D
Shadow Alley Denizen is a really good card for mono black decks. Especially if you're going to be pooping out tokens with Bloodline Keeper.
You should add Endless Ranks of the Dead. It's very cheap for its effect in my opinion; I think it should be a staple in any Zombie deck. Another thing you might consider is Call to the Grave.
Against any deck that can protect their creatures, you would probably be pretty screwed. I have two suggestions:1) Glaring Spotlight, to avoid hexproof and for a potential last-minute win condition.2) Stromkirk Noble. This guy is great, he quickly becomes a huge force to be reckoned with.
A four drop? Blasphemy!