Mega Ton Magical Cannon is a Normal 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, Mega Ton Magical Cannon is Unlimited.
YGOPRODeck lists Mega Ton Magical Cannon for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, Speed Duel, TCG, OCG, Master Duel.
A listed print of Mega Ton Magical Cannon appears in Dark Revelation Volume 1 (DR1-EN149) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Mega Ton Magical Cannon is about $0.03 on Cardmarket (prices change frequently).
