Star 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, Star Blast is Unlimited.
YGOPRODeck lists Star Blast for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Star Blast appears in Battle Pack 2: War of the Giants (BP02-EN154) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Star Blast is about $0.15 on TCGPlayer (prices change frequently).
