Hello, I don’t have much to add but, when I was reading about shardbearer combat in a 1v1 situation I couldn’t help but think of Windruners and Heavenly Ones. Although not Shardbearers, when the two acknowledge a duel, those near “honor” the duel allowing the two to fight uninterrupted, much like Adolin and Abidi. But with heavenly ones duels, they accept defeat of their opponents without killing them. This could possibly allow for shardbearer to engage in a duel with another bearer, but also allow them to disengage and retreat if the battle requires it, causing the other shardbearer to allow this retreat without an attack of opportunity. Maybe this disengage retreat could be the qualification for a lost round to the one choosing to disengage and keep their shardbearer up.
Also earlier there was talk of an actual tower on the field that could be attacked and defended. For this I had the idea of having the Joker card as a stand in for the tower. There’s two jokers in most standard decks allowing for each player(assuming that one deck accounts for 2 players) to each take a joker as their tower and place it on the “board” to protect and attack. Unless I have missed where the joker is used in the rules thus far, I think this is a good use of the card for those looking for a “physical” tower that is not the deck of the player.