Be careful with the wording on that card. It only reduces 1 AP for attack cards that turn, not all action cards. So if no cards played that turn have the Attack keyword, it is basically a waste of a card (in which case you're better saving it in your hand for your next turn). :pEven more restrictive: it's only "Attack actions." Which means attacks played as Reactions (such as the Brigand's Shadow's Reach) don't get a discount either.