Sanguine Swamp is a Continuous 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, Sanguine Swamp is Unlimited.
YGOPRODeck lists Sanguine Swamp for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Sanguine Swamp appears in Light of Destruction (LODT-EN077) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Sanguine Swamp is about $0.04 on TCGPlayer (prices change frequently).
