Sound the Retreat! 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, Sound the Retreat! is Unlimited.
YGOPRODeck lists Sound the Retreat! for these formats: Duel Links, TCG, OCG, Master Duel.
A listed print of Sound the Retreat! appears in Photon Shockwave (PHSW-EN077) at Short Print rarity.
Among markets shown on this page, the lowest listed snapshot for Sound the Retreat! is about $0.22 on TCGPlayer (prices change frequently).
