Thank you!
We tried to add the card sorting mechanic to spice up the strategy aspect, so there's still some other type of skill involved. The way that dice rolls impact attack and defense could definitely be telegraphed better, but the idea is whatever number you put in your attack / defense is how many hp you can potentially deal in damage or defend from being damaged. The # of cards sorted then determines how many hp you successfully attack for or defend against out of that number you rolled. Even still, the dice rolls could potentially do little to impact gameplay so I see where you're coming from.
We appreciate the feedback!