Book of Moon is a Quick-Play 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 Moon is Unlimited.
YGOPRODeck lists Book of Moon for these formats: GOAT, OCG GOAT, Duel Links, Speed Duel, Common Charity, Edison, TCG, OCG, Master Duel.
Book of Moon belongs to the Book of archetype—use that tag when searching for engine pieces and tech options.
A listed print of Book of Moon appears in 2-Player Starter Set (STAX-EN025) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Book of Moon is about $0.10 on Cardmarket (prices change frequently).
