Grim Roustabout is a common Creature — Skeleton Warrior card from Return to Ravnica (RTR), collector number 68. Current market price: $0.18 (foil $0.30), TCGplayer market prices via Scryfall.
Unleash (You may have this creature enter with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.) {1}{B}: Regenerate this creature.