Chaos Seed 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, Chaos Seed is Unlimited.
YGOPRODeck lists Chaos Seed for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
Chaos Seed belongs to the Chaos archetype—use that tag when searching for engine pieces and tech options.
A listed print of Chaos Seed appears in Duelist Alliance (DUEA-EN092) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Chaos Seed is about $0.18 on Cardmarket (prices change frequently).
