Yes, I think it would make sense to rent some cards and make it more enjoyable. Either a level 3 summoner and some level 3 commons, level 2 epics and rares.

Or just a few cheap legendaries. A ruler of the seas or kron the undying go a long way in Bronze.

Either way, i'd keep it at below 40-50 DEC per day as I wouldn't want to play just to pay off the rental.