Magical Stone Excavation 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, Magical Stone Excavation is Unlimited.
YGOPRODeck lists Magical Stone Excavation for these formats: OCG GOAT, Duel Links, Speed Duel, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Magical Stone Excavation appears in Champion Pack: Game Two (CP02-EN001) at Ultra Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Magical Stone Excavation is about $0.12 on Cardmarket (prices change frequently).
