Koa'ki Meiru Shield is a Normal Trap Card.
Trap Cards are normally Set first and can be activated on a later turn, often in response to an action.
On the current TCG and OCG Forbidden & Limited lists tracked here, Koa'ki Meiru Shield is Unlimited.
YGOPRODeck lists Koa'ki Meiru Shield for these formats: Duel Links, TCG, OCG, Master Duel.
Koa'ki Meiru Shield belongs to the Koa'ki Meiru archetype—use that tag when searching for engine pieces and tech options.
A listed print of Koa'ki Meiru Shield appears in The Shining Darkness (TSHD-EN077) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Koa'ki Meiru Shield is about $0.11 on TCGPlayer (prices change frequently).
