Dark Magic Mirror Force

When an opponent's monster declares an attack, or an opponent's monster effect is activated that would destroy a monster(s) on the field, and a monster that mentions "Shining Sarcophagus" is on the field: The next time each monster you control that mentions "Shining Sarcophagus" would be destroyed by battle or card effects this turn, it is not destroyed, also destroy all opponent's Attack Position monsters, then, if you control "Dark Magician", inflict 500 damage to your opponent for each monster destroyed by this effect.