Team up with an alliance member

I would like a new event or war, where you have to team up with an alliance member, you have to create 5 teams blindly, like team number 1 i pick 3 of my heros to be in the team and he or she picks 2. In team number 2 he or she picks 3 of their heroes and and i pick 2 and it continues until 5 teams are made. Thats 5 defence teams against an another alliance, same goes for attack teams. That goes for the whole alliance and then you count the victory margin in each game, there os five attacks from us and 5 attacks from them and we cant attack the same defence team. Maybe it sounds complicated, but i think it would be fun teaming up with one from your alliance.