Armageddon Designator 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, Armageddon Designator is Unlimited.
YGOPRODeck lists Armageddon Designator for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Armageddon Designator appears in 2014 Mega-Tin Mega Pack (MP14-EN112) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Armageddon Designator is about $0.08 on Cardmarket (prices change frequently).
