I have used this only two times and I think one of them it did not work as I expected. Should I use All Out Attack then play any other attack card to get its bonus? Or does All Out Attack work like a trait ? as in You play your attack card it then it adds the bonus and is discarded?
The boost ability triggers whenever you play another attack, and because it does not have the keep keyword it is discarded like any other used card. This is unlike Bash which has a boost ability with the keyword keep. However, if you were to play All Out Attack first, then you would simply use the attack aspect of the card.