Gemini Spark is a Quick-Play 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, Gemini Spark is Unlimited.
YGOPRODeck lists Gemini Spark for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Gemini Spark appears in Astral Pack Two (AP02-EN011) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Gemini Spark is about $1.49 on eBay (prices change frequently).
