De-Synchro 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, De-Synchro is Unlimited.
YGOPRODeck lists De-Synchro for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of De-Synchro appears in Duel Terminal 6b (DT06-EN092) at Duel Terminal Normal Parallel Rare rarity.
Among markets shown on this page, the lowest listed snapshot for De-Synchro is about $0.07 on Cardmarket (prices change frequently).
