Piccolo, Fusing With Nail

[Energy-Exhaust] [Critical] [Permanent] Once per turn, if this card would be KO'd in battle, you may place 1 card from under this card in its owner's Drop Area instead. [Activate:Battle] [Once per turn] Switch this card to Rest Mode : Choose up to 1 of your opponent's Battle Cards with an energy cost of 5 or less in Rest Mode and KO it. If you KO'd a card, your opponent discards 1 card from their hand.