Magical Mallet 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 Mallet is Unlimited.
YGOPRODeck lists Magical Mallet for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Magical Mallet appears in Duel Terminal 2 (DT02-EN094) at Duel Terminal Normal Parallel Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Magical Mallet is about $0.21 on Cardmarket (prices change frequently).
