Book of Secret Arts is a Equip 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, Book of Secret Arts is Unlimited.
YGOPRODeck lists Book of Secret Arts for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
Book of Secret Arts belongs to the Book of archetype—use that tag when searching for engine pieces and tech options.
A listed print of Book of Secret Arts appears in Legend of Blue Eyes White Dragon (LOB-043) at Short Print rarity.
Among markets shown on this page, the lowest listed snapshot for Book of Secret Arts is about $0.03 on Cardmarket (prices change frequently).
