Screaming Nemesis is a mythic Creature — Spirit card from Duskmourn: House of Horror (DSK), collector number 157. Current market price: $7.59 (foil $8.28), TCGplayer market prices via Scryfall.
Haste Whenever this creature is dealt damage, it deals that much damage to any other target. If a player is dealt damage this way, they can't gain life for the rest of the game.