Mischief of the Gnomes (SECE-EN081) - Secrets of Eternity Unlimited

This turn, reduce the Levels of all monsters in each player's hand by 1 (even after they are Summoned/Set). You can banish this card from the Graveyard; this turn, reduce the Levels of all monsters in each player's hand by 1 (even after they are Summoned/Set).