Gum-Gum Lightning (OP09-077) - Emperors in the New World

[Main] DON!! 2 (You may return the specified number of DON!! cards from your field to your DON!! deck.): K.O. up to 1 of your opponent's Characters with 6000 power or less.
[Trigger] Add up to 1 DON!! card from your DON!! deck and set it as active.