The Seal of Orichalcos

All monsters you control gain 500 ATK. Once per turn, this card cannot be destroyed by card effects. While you control 2 or more face-up Attack Position monsters, your opponent cannot target monster(s) with the lowest ATK for an attack. When this card is activated: Destroy all Special Summoned monsters you control. You cannot Special Summon monsters from your Extra Deck. You can only activate "The Seal of Orichalcos" once per Duel.