Synchro Cracker 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, Synchro Cracker is Unlimited.
YGOPRODeck lists Synchro Cracker for these formats: Common Charity, TCG, OCG, Master Duel.
A listed print of Synchro Cracker appears in High-Speed Riders (HSRD-EN013) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Synchro Cracker is about $0.17 on Cardmarket (prices change frequently).
