Poseidon Wave is a Normal Trap Card.
Trap Cards are normally Set first and can be activated on a later turn, often in response to an action.
On the current TCG and OCG Forbidden & Limited lists tracked here, Poseidon Wave is Unlimited.
YGOPRODeck lists Poseidon Wave for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Poseidon Wave appears in Battle Pack 3: Monster League (BP03-EN223) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Poseidon Wave is about $0.11 on Cardmarket (prices change frequently).
