Decisive Denial is a uncommon Instant card from Strixhaven: School of Mages (STX), collector number 382. Current market price: $0.39 (foil $0.99), TCGplayer market prices via Scryfall.
Choose one — • Target creature you control fights target creature you don't control. (Each deals damage equal to its power to the other.) • Counter target noncreature spell unless its controller pays {3}.