Dark Contract with the Witch 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 Contract with the Witch is Unlimited.
YGOPRODeck lists Dark Contract with the Witch for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
Dark Contract with the Witch belongs to the D/D archetype—use that tag when searching for engine pieces and tech options.
A listed print of Dark Contract with the Witch appears in 2016 Mega-Tin Mega Pack (MP16-EN170) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Dark Contract with the Witch is about $0.12 on Cardmarket (prices change frequently).
