Shien's Smoke Signal is a Normal 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 Smoke Signal is Unlimited.
YGOPRODeck lists Shien's Smoke Signal for these formats: Common Charity, TCG, OCG, Master Duel.
Shien's Smoke Signal belongs to the Six Samurai archetype—use that tag when searching for engine pieces and tech options.
A listed print of Shien's Smoke Signal appears in OTS Tournament Pack 26 (OP26-EN025) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Shien's Smoke Signal is about $0.25 on Cardmarket (prices change frequently).
