Gust Fan is a Equip Spell Card.
Spell Cards are usually activated from the hand on your turn unless their type gives another timing window.
On the current TCG and OCG Forbidden & Limited lists tracked here, Gust Fan is Unlimited.
YGOPRODeck lists Gust Fan for these formats: GOAT, OCG GOAT, Duel Links, Edison, TCG, OCG, Master Duel.
A listed print of Gust Fan appears in Tournament Pack: 1st Season (TP1-011) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Gust Fan is about $1.16 on Cardmarket (prices change frequently).
