Shien's Castle of Mist is a Field 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, Shien's Castle of Mist is Unlimited.
YGOPRODeck lists Shien's Castle of Mist for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
Shien's Castle of Mist belongs to the Six Samurai archetype—use that tag when searching for engine pieces and tech options.
A listed print of Shien's Castle of Mist appears in Gold Series 2009 (GLD2-EN041) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Shien's Castle of Mist is about $0.18 on Cardmarket (prices change frequently).
