Battle Mania — Ruling

Effetto 0

• This card's effect does not target.
• This card's effect is applied to any face-up monsters your opponent controls at the time its activation resolves.
• If this card's effect has been applied to any of your opponent's monsters which can attack, your opponent must enter the Battle Phase. (They cannot end their turn without entering the Battle Phase.)
• This card cannot be activated if your opponent controls no face-up monsters.