It can work any way we want really. I would just prefer that the rewards be based on the cards used in the battle - not just cards sitting in your collection. So the math can be worked out to be the same - if a player is in Diamond but uses level 1 cards in the battle, their rewards can be Bronze league level, just like if they had very low CP as in this proposal.

So I'm suggesting that we keep the math and reward levels similar to this proposal, but base it on the cards used in the actual battle rather than CP so player's can't just get one GFL sitting in their collection and collect the high rewards.