Ashiok's Erasure is a rare Enchantment card from Theros Beyond Death Promos (PTHB), collector number 43p. Current market price: $0.40 (foil $0.40), TCGplayer market prices via Scryfall.
Flash When this enchantment enters, exile target spell. Your opponents can't cast spells with the same name as the exiled card. When this enchantment leaves the battlefield, return the exiled card to its owner's hand.