You can only use the (2)nd effect of this card’s name once per turn.
(1) Monsters you control that are “Ancient Gear Golem” or mention it are unaffected by your opponent’s activated monster effects.
(2) If your opponent controls a monster: You can Fusion Summon 1 Fusion Monster that mentions “Ancient Gear Golem” from your Extra Deck, by banishing materials mentioned on it from your field and/or GY, including “Ancient Gear Golem” you control, and if you do, it can make up to 3 attacks during each Battle Phase.