It’s a bit hassle changing the levels of each card while searching. It would be better to at least have the option to choose the league then the cards would appear.
For example “Bronze” then all max card bronze levels would automatically show out.
I personally use the ingame market to look for cards that I should rent for a league cause it displays the skills of different monsters at the sametime unlike in peakmonsters where I have to look at the cards one at a time.