Secrets of the Gallant is a Normal Trap Card.
Trap Cards are normally Set first and can be activated on a later turn, often in response to an action.
On the current TCG and OCG Forbidden & Limited lists tracked here, Secrets of the Gallant is Unlimited.
YGOPRODeck lists Secrets of the Gallant for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Secrets of the Gallant appears in Force of the Breaker (FOTB-EN054) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Secrets of the Gallant is about $0.12 on TCGPlayer (prices change frequently).
