His current ability is actually very unique. I think it would be a complete shame to nuke it completely just because we don't like it, especially if the replacement is more of a "brute force" type skill.
If you draw 3 damage cards, you have a 52% chance of getting a Direct Hit. Even if you don't get a direct hit, being able to choose one of three damage cards makes for some REALLY interesting and awesome situational tactics. The only problem is that the ability doesn't trigger often enough. Allowing one hit to get changed to a crit fixes this, without being overpowered (I think).