Lion's Threat Imperial Earth Bind (ST05-016) - Starter Deck 5: Film Edition

[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 a cost of 5 or less.
[Trigger] Add up to 1 DON!! card from your DON!! deck and set it as active.