[OP15-059_p1] - Amazon (Adventure on Kami's Island Release Event Cards)

What happens to this [On Your Opponent's Attack] effect if my opponent has no active DON!! cards in their cost area?

In this case, your opponent will be unable to return any of their DON!! cards to their DON!! deck after you rest this Character, meaning you can give up to 1 of your opponent's Leader or Character cards −2000 power during this turn.