Just put on what you feel the most comfortable with.
I got my first upgraded cards by farming T50 to sell those rares i win. In the beginning i lost every single game except for those against farms, and sometimes even then
Now i got a pretty strong deck (i think) and win most of my T50 games. Still i'm thankfull for every farm that gives me a free rare. I am thankfull for biting farms that give me rares i gotta fight for. And i am thankfull for very strong decks i don't get anything from just for the fun of facing them.
There are so many ways to have fun in this game besides complaining about this and that and everything.
Well, just my opinion. Thanks to all farm-decks for helping me having a good start into elements
Have fun