Big Wave Small Wave 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, Big Wave Small Wave is Unlimited.
YGOPRODeck lists Big Wave Small Wave for these formats: GOAT, OCG GOAT, Speed Duel, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Big Wave Small Wave appears in Dark Revelation Volume 3 (DR3-EN046) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Big Wave Small Wave is about $0.08 on Cardmarket (prices change frequently).
