Exchange is a Normal 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, Exchange is Unlimited.
YGOPRODeck lists Exchange for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, Speed Duel, TCG, OCG, Master Duel.
A listed print of Exchange appears in Dark Beginning 1 (DB1-EN170) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Exchange is about $0.09 on Cardmarket (prices change frequently).
