It is like a 2 side cutting knife :)
I will only focus on the daily rewards. Will upgrade all my monster which aren't at the max of the summoners yet.
I do have 2 summoners on L5 all the rest is at L4. So, if I get a card which is already at it's max for the summoner than it will go to the market! I can always invest the money back in Durgwars :)