Morgan, the Enchantress of Avalon - MP19-EN223 Prismatic Secret Rare Unlimited

When your opponent activates a card or effect, while you control a "Noble Knight" monster and a "Noble Arms" Equip Spell (Quick Effect): You can send this card from your hand to the GY; destroy 1 "Noble Arms" Equip Spell you control, and if you do, negate the activation. You can only use this effect of "Morgan, the Enchantress of Avalon" once per turn.