Opal, Undaunted Ranger

Fusion--When this creature enters the battlefield, exile a creature named Pearl, Crystal Aegis and a creature named Amethyst, Deformed Recruit. If you don't, return Opal to its owner's hand.
{t}: Add {w}{u} to your mana pool.If that mana is spent on a noncreature spell, Opal deals 3 damage to target creature or player.
When Opal dies, return the exiled cards to the battlefield under your control.