The Mask of Remnants 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, The Mask of Remnants is Unlimited.
YGOPRODeck lists The Mask of Remnants for these formats: OCG GOAT, Duel Links, Speed Duel, Common Charity, Edison, TCG, OCG, Master Duel.
The Mask of Remnants belongs to the Mask archetype—use that tag when searching for engine pieces and tech options.
A listed print of The Mask of Remnants appears in Speed Duel: Battle City Box (SBCB-EN119) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for The Mask of Remnants is about $0.11 on Cardmarket (prices change frequently).
