Synchronized Realm is a Continuous 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, Synchronized Realm is Unlimited.
YGOPRODeck lists Synchronized Realm for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
Synchronized Realm belongs to the Synchron archetype—use that tag when searching for engine pieces and tech options.
A listed print of Synchronized Realm appears in Starter Deck: Yu-Gi-Oh! 5D's (5DS1-EN022) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Synchronized Realm is about $0.02 on Cardmarket (prices change frequently).
