Legendary Black Belt is a Equip 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, Legendary Black Belt is Unlimited.
YGOPRODeck lists Legendary Black Belt for these formats: GOAT, OCG GOAT, Duel Links, Edison, TCG, OCG, Master Duel.
A listed print of Legendary Black Belt appears in Dark Revelation Volume 3 (DR3-EN225) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Legendary Black Belt is about $0.20 on Cardmarket (prices change frequently).
