Pandemonium 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, Pandemonium is Unlimited.
YGOPRODeck lists Pandemonium for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, Speed Duel, TCG, OCG, Master Duel.
Pandemonium belongs to the Archfiend archetype—use that tag when searching for engine pieces and tech options.
A listed print of Pandemonium appears in Dark Crisis (DCR-094) at Short Print rarity.
Among markets shown on this page, the lowest listed snapshot for Pandemonium is about $0.16 on Cardmarket (prices change frequently).
