Replace Opponent with Sparky on Concede
When an opponent concedes in MTG Arena, the game ends immediately. This creates two problems. First, it can cause lost quest or daily progress. For example, if my daily is “attack with 45 creatures” and I am about to swing with 30 attackers, a concession robs me of that progress. Second, it removes the payoff of watching my deck finish what it was built to do. In paper Magic, conceding doesn’t erase the board state — it just means your opponent isn’t sitting there anymore.
My suggestion is that when an opponent concedes, they are replaced by Sparky AI. Sparky doesn’t need to be smart, just pass priority and assign basic blocks so the game can resolve. This way the conceding player still leaves immediately, but the remaining player gets full quest credit and the closure of finishing the game. It would make Arena feel more consistent, more rewarding, and less frustrating when wins are cut short.