New game type (Evolve in League)

I will say immediately that I've never played Evolved but I've watched one video of it so if I didn't quite understand what I was looking at I can still say this sounds like fun if the balance is done right. I propose a 1v5 game mode that starts in a circle arena where the 5 spawn in the middle and the 1 spawns random in the map (the map has to be rather large) the 5 start at lvl 11 and a bit of gold to buy stuff while the 1 starts at lvl 1 with normal starting gold (shops should be scattered around the map so no one can camp the shops waiting for the 1) the 1 should be playing a doom champion (used in doom bots) mobs should be scattered around the map to grant the 1 buffs, lvl, and gold. The 5 don't get much for killing mobs, maybe denial and buffs. The 5 can not lvl they can not get gold. So what they lvled at the start and what they buy they're stuck with it. The 1 can get to lvl 18 and buy 6 items and is also a doom champ so if you let him live for to long he'll destroy you and get a penta. That's the basic idea talk about it in replies and maybe we can come up with a game mode that will make a good 1v5 experience. Game ends when the 1 dies or when the 1 completes an assault on the base in the middle of the map.