Slaughter Specialist is a rare Creature — Vampire Warrior card from Innistrad: Midnight Hunt (MID), collector number 349. Current market price: $1.65 (foil $1.73), 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.