Gluttonous Slime is a uncommon Creature — Ooze card from Conflux (CON), collector number 83. Current market price: $0.31 (foil $0.78), TCGplayer market prices via Scryfall.
Flash Devour 1 (As this creature enters, you may sacrifice any number of creatures. It enters with that many +1/+1 counters on it.)