Once during your turn (before your attack), if there is any Darkness Energy attached to Umbreon, you may look at your opponent's hand. Then, you may choose 1 card in your opponent's hand for each Darkness Energy attached to Umbreon. (If your opponent has fewer cards than that, choose all or none of them.) Your opponent shuffles those cards into his or her deck and draws the same number of cards. This power can't be used if Umbreon is affected by a Special Condition.
The Defending Pokémon can't retreat during your opponent's next turn.