Festercreep is a common Creature — Elemental card from Commander 2016 (C16), collector number 110. Current market price: $0.21, 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.