Advanced format ruling
Battle Mania
Card effect (current official text)Activate only during your opponent's Standby Phase. All face-up monsters your opponent controls are changed to Attack Position, and cannot change their battle positions this turn. All monsters your opponent currently controls must attack this turn, if able.
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.