Jade Insect Whistle 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, Jade Insect Whistle is Unlimited.
YGOPRODeck lists Jade Insect Whistle for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Jade Insect Whistle appears in Dark Revelation Volume 2 (DR2-EN101) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Jade Insect Whistle is about $0.05 on Cardmarket (prices change frequently).
