Doomskar is a rare Sorcery card from Kaldheim Promos (PKHM), collector number 9s. Current market price: — (foil $3.37), 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.)