Ravenous Slime is a rare Creature — Ooze card from Commander 2018 (C18), collector number 34. Current market price: $2.15, TCGplayer market prices via Scryfall.
This creature can't be blocked by creatures with power 2 or less. If a creature an opponent controls would die, instead exile it and put a number of +1/+1 counters equal to that creature's power on this creature.