Gemini Booster 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, Gemini Booster is Unlimited.
YGOPRODeck lists Gemini Booster for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Gemini Booster appears in Stardust Overdrive (SOVR-EN076) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Gemini Booster is about $0.11 on Cardmarket (prices change frequently).
