A Hero Emerges 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, A Hero Emerges is Unlimited.
YGOPRODeck lists A Hero Emerges for these formats: GOAT, OCG GOAT, Duel Links, Speed Duel, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of A Hero Emerges appears in Battle Pack 2: War of the Giants (BP02-EN179) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for A Hero Emerges is about $0.05 on Cardmarket (prices change frequently).
