Spawn of Rix Maadi is a common Creature — Horror card from Return to Ravnica (RTR), collector number 199. Current market price: $0.09 (foil $0.37), 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.)