Unification is a Continuous Trap Card.
Trap Cards are normally Set first and can be activated on a later turn, often in response to an action.
On the current TCG and OCG Forbidden & Limited lists tracked here, Unification is Unlimited.
YGOPRODeck lists Unification for these formats: Common Charity, TCG, OCG, Master Duel.
A listed print of Unification appears in Abyss Rising (ABYR-EN079) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Unification is about $0.12 on Cardmarket (prices change frequently).
