Celestia is a Field 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, Celestia is Unlimited.
YGOPRODeck lists Celestia for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Celestia appears in 2015 Mega-Tin Mega Pack (MP15-EN175) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Celestia is about $0.05 on Cardmarket (prices change frequently).
