Hydra - OP02-090 - Paramount War

[Main] DON!! −1(You may return the specified number of DON!! cards from your field to your DON!! deck.): Give up to 1 of your opponent's Characters −3000 power during this turn.[Trigger] If your opponent has 6 or more DON!! cards on their field, your opponent returns 1 DON!! card from their field to their DON!! deck.