Festercreep is a common Creature — Elemental card from The List (PLST), collector number CM2-63. Current market price: $0.20, TCGplayer market prices via Scryfall.
This creature enters with a +1/+1 counter on it. {1}{B}, Remove a +1/+1 counter from this creature: All other creatures get -1/-1 until end of turn.