Mathmech Equation 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, Mathmech Equation is Unlimited.
YGOPRODeck lists Mathmech Equation for these formats: Duel Links, TCG, OCG, Master Duel.
Mathmech Equation belongs to the Mathmech archetype—use that tag when searching for engine pieces and tech options.
A listed print of Mathmech Equation appears in Battles of Legend: Monstrous Revenge (BLMR-EN092) at Ultra Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Mathmech Equation is about $0.10 on Cardmarket (prices change frequently).
