Mask of Weakness 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, Mask of Weakness is Unlimited.
YGOPRODeck lists Mask of Weakness for these formats: GOAT, OCG GOAT, Duel Links, Speed Duel, Common Charity, Edison, TCG, OCG, Master Duel.
Mask of Weakness belongs to the Mask archetype—use that tag when searching for engine pieces and tech options.
A listed print of Mask of Weakness appears in 2-Player Starter Deck: Yuya & Declan (YS15-END19) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Mask of Weakness is about $0.04 on Cardmarket (prices change frequently).
