Festercreep is a common Creature — Elemental card from Commander Anthology Volume II (CM2), collector number 63. Current market price: $0.31, 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.