Half Unbreak 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, Half Unbreak is Unlimited.
YGOPRODeck lists Half Unbreak for these formats: Common Charity, TCG, OCG, Master Duel.
A listed print of Half Unbreak appears in 2016 Mega-Tin Mega Pack (MP16-EN040) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Half Unbreak is about $0.04 on Cardmarket (prices change frequently).
