Soul 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, Soul Exchange is Unlimited.
YGOPRODeck lists Soul Exchange for these formats: GOAT, OCG GOAT, Duel Links, Speed Duel, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Soul Exchange appears in 25th Anniversary Ultimate Kaiba Set (KC01-EN042) at Ultra Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Soul Exchange is about $0.05 on Cardmarket (prices change frequently).
