While you control no monsters: Target 1 face-up card you control; destroy it, and if you do, Special Summon 1 "Ancient Gear" monster from your Deck, ignoring its Summoning conditions.
You can banish this card from your Graveyard, then target 1 face-up card you control; destroy it, and if you do, Special Summon 1 "Ancient Gear Token" (Machine-Type/EARTH/Level 1/ATK 0/DEF 0).
You can only use 1 "Ancient Gear Catapult" effect per turn, and only once that turn.