Call of the Mummy 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, Call of the Mummy is Unlimited.
YGOPRODeck lists Call of the Mummy for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, Speed Duel, TCG, OCG, Master Duel.
A listed print of Call of the Mummy appears in Battle Pack 3: Monster League (BP03-EN146) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Call of the Mummy is about $0.07 on Cardmarket (prices change frequently).
