Attack immunity
Attack immunity is the name given to the effect present on a number of cards that makes you completely unaffected by your opponent's attacks. While there exist other ways of mitigating the impacts of certain attacks, such as trashing incoming junk using Watchtower, cards providing attack immunity completely nullify all forms of attack.
Attack immunity only works against attack cards if it is in force when the attack is played. In the case of duration attacks such as Swamp Hag, if your opponent plays their attack before you put attack immunity into effect, you will still suffer the effects of the attack.
Noble Brigand also performs its attack when it is bought. Attack immunity does not block the attack in this case, as buying Noble Brigand is not playing it.
List of cards
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