Forbid is a special Instant card from Amonkhet Invocations (MP2), collector number 33. Current market price: — (foil $39.34), TCGplayer market prices via Scryfall.
Buyback—Discard two cards. (You may discard two cards in addition to any other costs as you cast this spell. If you do, put this card into your hand as it resolves.) Counter target spell.