Whatever the current tier system needs to change. I don’t mind playing against very challenging decks from experienced players but I can’t even enjoy playing my normal decks that aren’t meant to be menacing. It sucks the fun and enjoyment out of playing MTG. My suggestion is that each deck created should receive a tier rank to play against based on stats instead of the player overall. If I want to play a low ranked deck then I should be able to. If I want to play a well oiled machine of a deck then I should be able to do that too. All without demolishing others or being demolished against a deck that has fallen below or risen above that level of play.