Dark Corridor is a Normal Spell Card.
Spell Cards are usually activated from the hand on your turn unless their type gives another timing window.
On the current TCG and OCG Forbidden & Limited lists tracked here, Dark Corridor is Unlimited.
YGOPRODeck lists Dark Corridor for these formats: TCG, OCG, Master Duel.
A listed print of Dark Corridor appears in 25th Anniversary Tin: Dueling Mirrors (MP24-EN103) at Prismatic Secret Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Dark Corridor is about $2.59 on Cardmarket (prices change frequently).
