Unified Front is a Normal 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, Unified Front is Unlimited.
YGOPRODeck lists Unified Front for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Unified Front appears in 2017 Mega-Tin Mega Pack (MP17-EN115) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Unified Front is about $0.06 on Cardmarket (prices change frequently).
