Gemini Counter 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, Gemini Counter is Unlimited.
YGOPRODeck lists Gemini Counter for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Gemini Counter appears in Stardust Overdrive (SOVR-EN075) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Gemini Counter is about $0.16 on Cardmarket (prices change frequently).
