It would have been more beneficial for the card to fail.... I don't think that can be said about any other game. You should at least be able to remove it if your given something that doesn't apply to the hero and there is nothing you can do to make them use it. I just failed a card at 80% I don't need my percentages going down further than that for an attribute they are unable to use. For me it's simple, if your given an attribute that your unable to use you reset it and waste your card, i should not have to sacrifice all other attributes on the character.