Fell Priest of Dark Desires

Flying, Lifelink
Sacrifice a creature: Put a +1/+1 counter on Fell Priest of Dark Desires, it gains deathtouch until end of turn.
{t}, Discard a card: Fell Priest of Dark Desires deals damage equal to its power to target creature an opponent controls. If that creature dies this turn, return it to the battlefield under your control, it becomes a Vampire in addition to its other types.