Mono-Black Vampires
Bloodline Keeper
is a really good vampire that generates flyers then becomes an even better vampire that boosts all the other ones.
Captivating Vampire is another good lord that also allows you to take control of other creatures.
dark imposter
is a vampire I personally like, not the strongest in the deck, but I like the removal aspect. The other ability is cool but I would still use him without it.
Mirri the Cursed
is a powerful vampire that hits ridiculously hard.
Pulse Tracker
in my opinion is the best one cost vampire for black.
Vampire Nighthawk is self explanatory. It's good, trust me
Vampire Nocturnus possibly pumps your vampires, but in mono-black, is probably will. This pump is massive as well. It makes all your vampires ridiculous, even though a majority of them already have flying.
For removal Go for the Throat and Tragic Slip and just staple removal cards. For vampires, Urge to Feed and Feast of Blood are powerful removal spells that benefit from controlling vampires.
Curse of the Cabal
always works well, either your opponent sacrifices permanents to prevent it from being cast, or it's cast.
Liliana Vess tutors cards, makes an opponent discard and brings all creatures back. She's just good. Then again all Planeswalkers are good.
Sorin Markov has small creature removal, a little life gain, drops opponent's life totals, brings yours up from super small amounts and finally, control your opponent's next turn. This can be absolutely devastating.