Darklight 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, Darklight is Unlimited.
YGOPRODeck lists Darklight for these formats: Duel Links, Speed Duel, Common Charity, TCG, OCG, Master Duel.
A listed print of Darklight appears in Photon Shockwave (PHSW-EN075) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Darklight is about $0.10 on Cardmarket (prices change frequently).
