I made a Vampire deck earlier today, majority of it is black, some red. It's pretty powerful and a lot of the creatures are low cost. You're welcome to take a look at it as a reference.
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Pretty great build, only issue is that you've invested all your eggs in one basket. You have too many "one-offs." You need to base your deck with a second strategy other than just life gains. Otherwise, nice build!
I like this deck, low costs to play your cards. Only issue is that you can't play two of the exact same Plainswalkers on the field at the same time, might want to pick up a second Plainswalker. Possibly Elspeth Tirel?