Hmmm...I play two accounts, one in Bronze & Silver and I noticed that I get more cards in Bronze then Silver for my dailies. It's not many cards, but the way to do it is to farm at either Bronze 1 or Silver 1 whichever league you are in. Makes it less of a grind.

With a decent ECR and some luck, you might be able to get 8-10 chests with around 1-2 hours of play. So for yourself, if you are not pushing to Silver 1, I would recommend staying in Bronze league and farming the chests there.

Lastly, if you are not renting, you should consider it as the rentals have sort of gone back to normal and you can pick up some really affordable Lvl 1 cards and use them since all wins contribute to the RP. I think I spend around 10-15 DEC daily for my main decks (Earth, Water & Life) and another 50 DEC for CP to stay in Silver 1.