Lightsworn Judgment 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, Lightsworn Judgment is Unlimited.
YGOPRODeck lists Lightsworn Judgment for these formats: Common Charity, TCG, OCG, Master Duel.
Lightsworn Judgment belongs to the Lightsworn archetype—use that tag when searching for engine pieces and tech options.
A listed print of Lightsworn Judgment appears in 2017 Mega-Tin Mega Pack (MP17-EN237) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Lightsworn Judgment is about $0.15 on Cardmarket (prices change frequently).