Lightning Blade 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, Lightning Blade is Unlimited.
YGOPRODeck lists Lightning Blade for these formats: GOAT, OCG GOAT, Duel Links, Speed Duel, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Lightning Blade appears in Dark Beginning 1 (DB1-EN225) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Lightning Blade is about $0.02 on Cardmarket (prices change frequently).
