Beseech the Mirror is a mythic Sorcery card from Wilds of Eldraine (WOE), collector number 336. Current market price: $27.57 (foil $91.38), TCGplayer market prices via Scryfall.
Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.) Search your library for a card, exile it face down, then shuffle. If this spell was bargained, you may cast the exiled card without paying its mana cost if that spell's mana value is 4 or less. Put the exiled card into your hand if it wasn't cast this way.