Exterio's Fang is a Counter 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, Exterio's Fang is Unlimited.
YGOPRODeck lists Exterio's Fang for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
Exterio's Fang belongs to the Naturia archetype—use that tag when searching for engine pieces and tech options.
A listed print of Exterio's Fang appears in OTS Tournament Pack 18 (POR) (OP18-PT036) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Exterio's Fang is about $0.16 on Cardmarket (prices change frequently).
