Adamantine Lord

If Adamantine Lord is targeted by a spell, counter that spell and exile it. When Adamantine Lord attacks, you may cast that spell from exile as if it had Flash and mana of any type can be spent to cast that spell.

When an opponent targets a creature you control with an instant or sorcery spell, you may exert Adamantine Lord. If you do, Adamantine Lord becomes the only target of that instant or sorcery spell.