Advanced format ruling
Proof of Powerlessness
Card effect (current official text)Activate only while you control a face-up Level 7 or higher monster. Destroy all face-up Level 5 or lower monsters your opponent controls. Monsters you control cannot attack this turn.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.