Saath, Hope of the Deprived

Whenever you gain life, you may create a 1/1 black vampire creature token.
{t}: Tap 3 untapped Vampires you control, destroy target creature, gain life equal to its toughness.
Pay 7 life: Untap target vampire you control.
The moon is my sun, the night is my day, blood is my life and you are my prey.