Army vs Army Arena

So I was thinking how cool it would be if two random players could have live battles in an arena setting with an army vs army set up rather than army vs base. The reward could be a set amount of gems based on daily ranking. (Daily rankings because otherwise the #1 player could decide to go inactive so nobody could challenge him/her and take their spot) I know it sound like it could be lopsided so I thought a series of arena leagues dependant upon player levels could help even this out somewhat, such as lv1-lv10, lv11-lv20, lv21-lv30, etc....it's a rough idea, I know, I would love to hear any suggestions or critisims about this so I can work on improving it.