This nexus can only be deployed by paying the cost of 6.
[LV1] (Your End Step) When you have one spirit each in the colors Red, Purple, Green, White, Yellow and Blue, each player returns all their cards to their deck and shuffles. All core other than life is returned to the void. After that, each player moves six core from the void to their reserve, draws two cards, plays rock-paper-scissor to decide the playing order, and the game starts again from turn 1. This card effect only be used by either you or your opponent once per game.