Repentant Vampire

Repentant Vampire

Creature - Vampire | Power/Toughness: 3 / 3 (CMC 5)
Flying
Whenever a creature dealt damage by Repentant Vampire this turn dies, put a +1/+1 counter on Repentant Vampire.
Threshold -- As long as seven or more cards are in your graveyard, Repentant Vampire is white and has ": Destroy target black creature."