Wave Clear defense game type!!

After seeing the Zombie/Slayer video, I got the idea that there should be a wave defense game type. It could have a basic five champion comp picked out and a point system that allows you to unlock more champions within the role you play in the game type (Tanks, Marksmen, Mages, Support, and a Juggernaut. I could see this starting with Demacians such as The growth system could depend on kills, rounds, etc. The basic layout of the game would be the players defending a nexus or a turret from endless waves of minions. After each round is time allotted for shopping. Minions could spawn in 360 degree radius or have lanes they come from. Eventually jungle camps/buffs and Dragons could spawn too. Obviously there is a lot more room for improvement of the idea, but I think it could be a really in depth game type that is a complete change in style and could involve a lot of team work, planning, and creative use of the champions as they are used in a different setting. (Like how you use different strategies for Dominion and ARAM with the same champions.)

The system that I think would make this the most enjoyable is one that allows you to unlock better champions in a specific role by playing that role. You could earn role specific experience and use it to by more effective champions, like start with vayne whose wave clear isnt the best but can eventually make a really strong effect to eventually unlock cait then lastly sivir because of her natural wave clear abilities. Similarly work with other roles this way.

Also leave room to unlock minion skins like zombies or void style creeps ( A void dragon would look super epic flying towards your base with a swarm of voidlings at his side.)

The matchmaking system would be like teambuilder but with roles, so you go into a match search having already selected the role you want to play, and then the system finds you a game where that role is needed. Once all 5 are met, the match can begin.

You would not be allowed to mix up the comp. The roles remain the same to maintain balance in the game type.

Basic issues I forsee right now are champion-only effective skills like garen and cait's ults, or caits traps. There would be kit work to possibly adjust them so they could use traps on minions, and ult larger creeps or something. That and it would probably need its own unique