Release Restraint 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, Release Restraint is Unlimited.
YGOPRODeck lists Release Restraint for these formats: GOAT, OCG GOAT, Speed Duel, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Release Restraint appears in Dark Revelation Volume 3 (DR3-EN164) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Release Restraint is about $0.09 on Cardmarket (prices change frequently).
