Fiend's Sanctuary 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, Fiend's Sanctuary is Unlimited.
YGOPRODeck lists Fiend's Sanctuary for these formats: OCG GOAT, Duel Links, Speed Duel, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Fiend's Sanctuary appears in 25th Anniversary Ultimate Kaiba Set (KC01-EN047) at Ultra Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Fiend's Sanctuary is about $0.03 on Cardmarket (prices change frequently).
