Magical Blast 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 Blast is Unlimited.
YGOPRODeck lists Magical Blast for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Magical Blast appears in Spellcaster's Command Structure Deck (SDSC-EN031) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Magical Blast is about $0.04 on Cardmarket (prices change frequently).
