idea for new game mode

Ihad an idea for a new game mode, so i wanted to post on here and see if it's a dumb idea or not lol.

1v1v1v1v1: Free for All

-- The map would be sorta like a pentagon, and meeting in the middle

-- Each champion starts at their own fountain at each point of the pentagon

-- Each champion has 3 lives, and are able to recall

-- The game reaches a new stage once 3 Champions are eliminated;

-- 2 new nexus are now open, defended by an inner turret, inhibitor, and nexus turret, in the middle of the map connected by a straight line.

-- The game is then won by one champion destroying the other main nexus.

This is kind of a rough idea for something i just came up with this morning. Any ideas on this?