Game mode based on mastery champ

Since i play League of Legends i see a big problem when i'm playing normal games. There are so many champs, so even veteran players don't know perfectly how they all work. Got mastery from level 1 to level 7 it's good to see your progress with a champ, but i feel that matchmaking sometimes doesn't take into account my mastery with the champ i'm going to play vs the enemy champ mastery. So my proposal is to make a mode (blind or recruitment) specifically to play ONLY champs until mastery 5. Another possibility would be play ONLY champs with mastery 5 or higher. That could help people, even veteran, to play or practise new champs without being frustrated, tilted or bored playing vs other mastery champs. Sorry for my english and thanks for your time