I have a easy suggestion, to make a forth mode in the Attack Pop Up.
Live PvP will feature a Leaderboard with leagues.
Seasons what last 71 Days. And the leaderboard will be about Wins instead of Trophies. So whoever has the most wins win!
Every Season you Win's will reset back to (0). Each player will only be allowed to battle 5 times every 4 hours.
Leagues will reward you with Gems. and extra stuff.