Dark Cure 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, Dark Cure is Unlimited.
YGOPRODeck lists Dark Cure for these formats: Duel Links, Edison, TCG, OCG, Master Duel.
A listed print of Dark Cure appears in Yu-Gi-Oh! GX Tag Force Evolution promotional cards (GX05-EN002) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Dark Cure is about $1.18 on Amazon (prices change frequently).
