Fire Darts 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, Fire Darts is Unlimited.
YGOPRODeck lists Fire Darts for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Fire Darts appears in Cybernetic Revolution (CRV-EN049) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Fire Darts is about $0.13 on Cardmarket (prices change frequently).
