Timidity 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, Timidity is Unlimited.
YGOPRODeck lists Timidity for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Timidity appears in Dark Beginning 2 (DB2-EN236) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Timidity is about $0.18 on TCGPlayer (prices change frequently).
