Spell Economics 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, Spell Economics is Unlimited.
YGOPRODeck lists Spell Economics for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Spell Economics appears in Ancient Sanctuary (AST-089) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Spell Economics is about $0.17 on Cardmarket (prices change frequently).
