Kaio-Ken Son Goku, Strenuous Onslaught (BT8-025) - Malicious Machinations

[Auto] Choose 1 or 2 cards in your life and add them to your hand : When you play this card, it gets +5000 power for the duration of the turn, and at the start of your opponent's next Main Phase, choose up to 1 of your energy and switch it to Active Mode.