[REQUIREMENT] You can activate this by shuffling 2 monsters from your GY back into the Deck.
[EFFECT] Choose 1 face-up Level 8 or lower monster your opponent controls, until the end of the turn, it loses 300 ATK x [The number of Spell/Trap Cards in your opponent’s GY]. If there are 5 or more Spell Cards in your opponent’s GY, you can also choose 1 face-up monster your opponent controls with 1600 or less DEF and destroy it.