Shadow Spell 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, Shadow Spell is Unlimited.
YGOPRODeck lists Shadow Spell for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Shadow Spell appears in 25th Anniversary Ultimate Kaiba Set (KC01-EN059) at Ultra Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Shadow Spell is about $0.06 on Cardmarket (prices change frequently).
