Form Change is a Quick-Play 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, Form Change is Unlimited.
YGOPRODeck lists Form Change for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
Form Change belongs to the Masked HERO archetype—use that tag when searching for engine pieces and tech options.
A listed print of Form Change appears in HERO Strike Structure Deck (SDHS-EN020) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Form Change is about $0.22 on Cardmarket (prices change frequently).
