Book of Lunar Eclipse 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 Lunar Eclipse is Unlimited.
YGOPRODeck lists Book of Lunar Eclipse for these formats: Common Charity, TCG, OCG, Master Duel.
Book of Lunar Eclipse belongs to the Book of archetype—use that tag when searching for engine pieces and tech options.
A listed print of Book of Lunar Eclipse appears in 2022 Tin of the Pharaoh's Gods (MP22-EN099) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Book of Lunar Eclipse is about $0.25 on Cardmarket (prices change frequently).
