Ready Fusion is a Normal 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, Ready Fusion is Unlimited.
YGOPRODeck lists Ready Fusion for these formats: TCG, OCG, Master Duel.
A listed print of Ready Fusion appears in 2022 Tin of the Pharaoh's Gods (MP22-EN163) at Prismatic Secret Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Ready Fusion is about $0.30 on Cardmarket (prices change frequently).
