Kirby, Star Warrior

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