Big Bang Kamehameha

[Permanent] When you would pay the cost of this card in your hand, you may remove a total of 2 of your [Ki] instead. [Activate Main] Choose up to 1 Battle Card with "GT" in its card name in your Battle Area and choose up to 1 Battle Card with a cost less than or equal to the chosen card in your opponent's Battle Area and KO it. [Ki]: An energy marker placed under a card.)