Slaughter Specialist is a rare Creature — Vampire Warrior card from Innistrad: Double Feature (DBL), collector number 122. Current market price: $2.39 (foil $14.92), TCGplayer market prices via Scryfall.
When this creature enters, each opponent creates a 1/1 white Human creature token. Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature.