Mutually Affured Destruction 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, Mutually Affured Destruction is Unlimited.
YGOPRODeck lists Mutually Affured Destruction for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Mutually Affured Destruction appears in 2021 Tin of Ancient Battles (MP21-EN032) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Mutually Affured Destruction is about $0.13 on Cardmarket (prices change frequently).
