Big Bang Shot 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, Big Bang Shot is Unlimited.
YGOPRODeck lists Big Bang Shot for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Big Bang Shot appears in Battle Pack 2: War of the Giants (BP02-EN141) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Big Bang Shot is about $0.11 on Cardmarket (prices change frequently).
