Kaya's Onslaught is a uncommon Instant card from Kaldheim (KHM), collector number 18. Current market price: $0.31 (foil $0.21), TCGplayer market prices via Scryfall.
Target creature gets +1/+1 and gains double strike until end of turn. Foretell {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.)