Ancient Gear Castle is a Continuous Spell Card.
Spell Cards are usually activated from the hand on your turn unless their type gives another timing window.
On the current TCG and OCG Forbidden & Limited lists tracked here, Ancient Gear Castle is Unlimited.
YGOPRODeck lists Ancient Gear Castle for these formats: Duel Links, Speed Duel, Common Charity, Edison, TCG, OCG, Master Duel.
Ancient Gear Castle belongs to the Ancient Gear archetype—use that tag when searching for engine pieces and tech options.
A listed print of Ancient Gear Castle appears in Dark Revelation Volume 4 (DR04-EN167) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Ancient Gear Castle is about $0.13 on Cardmarket (prices change frequently).
