Rakdos the Defiler is a rare Legendary Creature — Demon card from Dissension (DIS), collector number 129. Current market price: $1.61 (foil $24.49), TCGplayer market prices via Scryfall.
Flying, trample Whenever Rakdos attacks, sacrifice half the non-Demon permanents you control, rounded up. Whenever Rakdos deals combat damage to a player, that player sacrifices half the non-Demon permanents they control of their choice, rounded up.