I agree with this idea in principle, but like others have said in the comments, players in champ should be able to play with cards at any level. There are cards that I fully believe ARE BETTER when not fully maxed out (I'm looking at you Gravebrand Warlock)! Also, there are lots of legendary cards, especially reward cards, that I don't have fully maxed out but still make a big difference for me when I play them at Level 2 and 3.

While I won't vote against this proposal because I like the idea, I won't vote FOR it until changes are made to allow players to use non-maxed cards in Champion League.