I like those ideas too! Imagine "magic cards take double magic damage" in a battle with a magic-only rule set. 😆
Not sure about the coding on confusion. I'm not much of a coder but it does sound challenging. Remember when they had the rental bug? If you happened to play a brawl or tournament with a card in your lineup that had been rented by the opponent previously, your units would attack your own card. It reminds me of that.