Ancient Gear Golem - Ultimate Pound (Ultra Rare) [DUPO-EN054-UR]

Cannot be Special Summoned. If this card attacks a Defense Position monster, inflict piercing battle damage. Up to twice per turn, when this attacking card destroys a monster by battle: You can discard 1 Machine monster; this card can attack again in a row. If this card on the field is destroyed by battle or card effect: You can add 1 "Polymerization" from your Deck to your hand, and if you do, add 1 other "Ancient Gear" monster from your GY to your hand.