Gravekeeper's Inscription 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, Gravekeeper's Inscription is Unlimited.
YGOPRODeck lists Gravekeeper's Inscription for these formats: TCG, OCG, Master Duel.
Gravekeeper's Inscription belongs to the Gravekeeper's archetype—use that tag when searching for engine pieces and tech options.
A listed print of Gravekeeper's Inscription appears in 25th Anniversary Tin: Dueling Mirrors (MP24-EN064) at Prismatic Secret Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Gravekeeper's Inscription is about $0.33 on Cardmarket (prices change frequently).
