Burden of the Mighty is a Continuous 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, Burden of the Mighty is Unlimited.
YGOPRODeck lists Burden of the Mighty for these formats: Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Burden of the Mighty appears in 2-Player Starter Set (STAX-EN032) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Burden of the Mighty is about $0.07 on Cardmarket (prices change frequently).
