Mystical Cards of Light 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, Mystical Cards of Light is Unlimited.
YGOPRODeck lists Mystical Cards of Light for these formats: Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Mystical Cards of Light appears in Light of Destruction (LODT-EN058) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Mystical Cards of Light is about $0.03 on Cardmarket (prices change frequently).
