Desecration Demon is a rare Creature — Demon card from Return to Ravnica (RTR), collector number 63. Current market price: $0.31 (foil $1.57), TCGplayer market prices via Scryfall.
Flying At the beginning of each combat, any opponent may sacrifice a creature of their choice. If a player does, tap this creature and put a +1/+1 counter on it.