Nocturnal Bloodbender

Play with the top card of your library revealed.
As long as the top card of your library is black
or a swamp, Nocturnal Bloodbender and other
Vampire creatures you control get +2/+1 and
have flying.
When Nocturnal Bloodbender or another
Vampire creature you control enters the
battlefield, each opponent loses 1 life and
you gain 1 life.