Muko 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, Muko is Unlimited.
YGOPRODeck lists Muko for these formats: GOAT, Duel Links, Edison, TCG, OCG, Master Duel.
A listed print of Muko appears in Dark Revelation Volume 3 (DR3-EN057) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Muko is about $0.25 on Amazon (prices change frequently).
