Repentant Vampire is a rare Creature — Vampire card from Odyssey (ODY), collector number 157. Current market price: $0.52 (foil $7.59), TCGplayer market prices via Scryfall.
Flying Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature. Threshold — As long as there are seven or more cards in your graveyard, this creature is white and has "{T}: Destroy target black creature."