roots bonus criples half the cards out there. montana win rounds super easy with bonus. arno has unstoppable dr. and spiaghi is 1 of the best 2* cards out there. then avola can 2hko with about anything. and this cost almost exactly 32k
Either go for a low star deck (18~21) stars which is impossible to do in mono as no clans have that many good 2* and 3*. If you search the tournament forums there have been quite a few 18* decks posted recently.
Go for a 2HKO deck which again is harder to achieve in mono. Especially with Montana as they tend to have low damage. Just choose a deck with no DR, poison, heal, +life.