Mystical Tether is a common Enchantment card from Outlaws of Thunder Junction (OTJ), collector number 19. Current market price: $0.17 (foil $0.07), TCGplayer market prices via Scryfall.
You may cast this spell as though it had flash if you pay {2} more to cast it. When this enchantment enters, exile target artifact or creature an opponent controls until this enchantment leaves the battlefield.