Enma's Judgment 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, Enma's Judgment is Unlimited.
YGOPRODeck lists Enma's Judgment for these formats: TCG, OCG, Master Duel.
A listed print of Enma's Judgment appears in Duel Overload (DUOV-EN042) at Ultra Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Enma's Judgment is about $0.05 on Cardmarket (prices change frequently).
