Hero Medal 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, Hero Medal is Unlimited.
YGOPRODeck lists Hero Medal for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Hero Medal appears in Duelist Pack: Jaden Yuki 3 (DP06-EN021) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Hero Medal is about $0.08 on Cardmarket (prices change frequently).
