Assault Counter is a Counter 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 Counter is Unlimited.
YGOPRODeck lists Assault Counter for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
Assault Counter belongs to the Assault Mode archetype—use that tag when searching for engine pieces and tech options.
A listed print of Assault Counter appears in Crimson Crisis (CRMS-EN075) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Assault Counter is about $0.15 on TCGPlayer (prices change frequently).
