Fusion Reserve 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, Fusion Reserve is Unlimited.
YGOPRODeck lists Fusion Reserve for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Fusion Reserve appears in 2015 Mega-Tin Mega Pack (MP15-EN185) at Ultra Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Fusion Reserve is about $0.07 on Cardmarket (prices change frequently).
