Burning Spear 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, Burning Spear is Unlimited.
YGOPRODeck lists Burning Spear for these formats: GOAT, OCG GOAT, Duel Links, Edison, TCG, OCG, Master Duel.
A listed print of Burning Spear appears in Tournament Pack: 1st Season (TP1-010) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Burning Spear is about $4.00 on Cardmarket (prices change frequently).
