Counters are cards that counteract attacks. They are played by the player who was attacked, immediately after the attack. You cannot counter a neutral action unless it is used as an attack on you, nor can you counter an attack on another player. You can counter a Counter, and so on. You can also use multiple Counters against an attack. Anti-Anti is a special card that counters a Counter, and is played on your own turn.

Neutral/Counter. Can be used in either way – as a neutral effect, or as a Counter.