Assault Mode Activate 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, Assault Mode Activate is Unlimited.
YGOPRODeck lists Assault Mode Activate for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
Assault Mode Activate belongs to the Assault Mode archetype—use that tag when searching for engine pieces and tech options.
A listed print of Assault Mode Activate appears in Crimson Crisis (CRMS-EN063) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Assault Mode Activate is about $0.06 on Cardmarket (prices change frequently).