Chaos Ancient Gear Giant

[ Machine / Fusion / Effect ] 4 "Ancient Gear" monsters Must be Fusion Summoned and cannot be Special Summoned by other ways. Unaffected by Spell/Trap effects. Your opponent's monsters cannot activate their effects during the Battle Phase. This card can attack all monsters your opponent controls, once each. If this card attacks a Defense Position monster, inflict piercing battle damage to your opponent. ATK/ 4500 DEF/ 3000