Maybe... consider :Duality: 2 elements 100% of deck can be upgradedTrio :3 elements 50% of the deck can be upgradedQuartz : 4 elements 25% of the deck can be upgraded
There is a reason for upped tourney and why its only 1of4... so why arguing for those rules, you have very many ways to meta duos with 4 elements. Upped or unupped. In case of other upped tourneys you can but have not to play upped cards... thats more unfair for players with less upped cards than this rule!