I've really enjoyed the Bronze and Silver objectives in online singles (when people aren't able to sub on their Meta go to players!). So why not have more of that?
You put in pack probabilities this year (what a joke that was btw) which meant less silver/bronze were packed throughout the year, which in turn made them more expensive for SBCs. Why not have cups, or mini leagues for people that want to use bronzes/silvers, and reward with a mixed player pack?
Also, and this is just a thought, why not add player bronze/silver rewards for winning games in this mode?
Bronzes and silvers need to be made more useful in the game.