Shien's Spy 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 Spy is Unlimited.
YGOPRODeck lists Shien's Spy for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Shien's Spy appears in Cybernetic Revolution (CRV-EN044) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Shien's Spy is about $0.06 on Cardmarket (prices change frequently).
