[REQUIREMENT] You can activate this by shuffling up to 5 monsters from your GY back into the Deck.
[EFFECT] Choose 1 face-up monster your opponent controls and it loses 300 ATK x [The number of monsters returned to the Deck by this effect’s Requirement] until the end of the turn. If this card is in Maximum Mode and there are no monsters in your GY, you can also choose and destroy 1 Spell/Trap Card your opponent controls.