Faustian Bargain 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, Faustian Bargain is Unlimited.
YGOPRODeck lists Faustian Bargain for these formats: Duel Links, Speed Duel, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Faustian Bargain appears in Speed Duel Starter Decks: Twisted Nightmares (SS05-ENB24) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Faustian Bargain is about $0.20 on Cardmarket (prices change frequently).
