Seed 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, Seed Cannon is Unlimited.
YGOPRODeck lists Seed Cannon for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Seed Cannon appears in Crimson Crisis (CRMS-EN057) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Seed Cannon is about $0.13 on Cardmarket (prices change frequently).
