Kirby, Star Warrior

When Kirby, Star Warrior attacks, exile a
creature under an opponent's control. Until end
of turn you may choose Kirby, Star Warrior to
have the exiled creatures abilities.
If you don't, you may spend the exiled creatures converted mana cost to deal damage equal to its
power to target creature or player. The exiled creature is returned to the battlefield under it's
owners control and the exiled creature deals
damage to itself equal to its power.