تنين الترس القديم

Cannot be Special Summoned. If you control no monsters, or only EARTH Machine monsters, you can Normal Summon this card without Tributing. When your opponent activates a Spell/Trap Card or effect (Quick Effect): You can send 1 Machine monster from your hand or face-up field, or 1 "Ancient Gear Golem" from your Deck, to the GY; negate that effect. You can only use this effect of "Ancient Gear Dragon" once per turn.