Doomskar is a rare Sorcery card from Kaldheim (KHM), collector number 334. Current market price: $0.84 (foil $1.08), TCGplayer market prices via Scryfall.
Destroy all creatures. Foretell {1}{W}{W} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)