Divide by Zero is a uncommon Instant card from Strixhaven: School of Mages (STX), collector number 41. Current market price: $0.22 (foil $0.35), TCGplayer market prices via Scryfall.
Return target spell or permanent with mana value 1 or greater to its owner's hand. Learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)