Voracious Greatshark is a rare Creature — Shark card from Ikoria: Lair of Behemoths Promos (PIKO), collector number 70p. Current market price: $0.26 (foil $0.33), TCGplayer market prices via Scryfall.
Flash (You may cast this spell any time you could cast an instant.) When this creature enters, counter target artifact or creature spell.