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Only C1 stays in Champ after season reset. C2/3 both get to enjoy the D for a bit. For context I play in C3 and hate getting bumped back to the D grind. (... just re-read that and it sounds kinda sexual... I like it! haha)

I think a percentage is better. Something like top 10% or top 1% (if there's a lot in champ) will be the only ones to stay in champ. Everyone else go to diamond 1. I think the BEST players in the game deserves it.