Diamond Core of Koa'ki Meiru 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, Diamond Core of Koa'ki Meiru is Unlimited.
YGOPRODeck lists Diamond Core of Koa'ki Meiru for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
Diamond Core of Koa'ki Meiru belongs to the Koa'ki Meiru archetype—use that tag when searching for engine pieces and tech options.
A listed print of Diamond Core of Koa'ki Meiru appears in Primal Origin (PRIO-EN065) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Diamond Core of Koa'ki Meiru is about $0.09 on Cardmarket (prices change frequently).
