Everliving Underworld Cannon 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, Everliving Underworld Cannon is Unlimited.
YGOPRODeck lists Everliving Underworld Cannon for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Everliving Underworld Cannon appears in Crossroads of Chaos (CSOC-EN060) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Everliving Underworld Cannon is about $0.15 on Cardmarket (prices change frequently).
