I think you hit on something absolutely brilliant here. You know you're playing a fantastic prototype when your mind is racing about all the possibilities of what a game could look like at its fullest form. The room for synergy in this game concept is incredible, and I had an absolute blast playing with it, feeling excited with every spin. I think if you ever do plan on expanding this into a full experience, which I really think you should, then I'd recommend giving the player the ability to hover over minions/heroes and having a little pop up that shows what their ability is. I think that'd make the game even more exciting. Just a fantastic job overall, you did something really awesome with the theme here!