Rare Value 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, Rare Value is Unlimited.
YGOPRODeck lists Rare Value for these formats: Duel Links, Speed Duel, Common Charity, Edison, TCG, OCG, Master Duel.
Rare Value belongs to the Crystal Beast archetype—use that tag when searching for engine pieces and tech options.
A listed print of Rare Value appears in Force of the Breaker (FOTB-EN033) at Ultimate Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Rare Value is about $0.10 on TCGPlayer (prices change frequently).
