Given that I've been playing through Arcade Mode, I thought I'd share some tips and descriptions of the levels to help you along.
First Stage: La Junta. It's rather easy given that it's the first level.
Second Stage: Sentinel and the Raptors work well against them.
Third Stage: Montana so make sure to counter their bonus with Piranas since they have good pillz abilities.
Fourth Stage: Than counteen there's Junkz and I found the Montanas work well since they cr the bonus and still take 4 attack points away.
Fifth Stage: It's Bangers which I suggest using the All-Stars for that level.
Sixth Stage: FPC so go with a deck that has good damage (wear them down before they can KO you) and can counter the bonus.
Seventh Stage: Then there's the Freaks and since their bonus is pretty nasty in this level, I'd suggest Nightmare or Piranas.
Eighth Stage: Next is All-Stars so use a clan with power boosters like Ulu Watu or Bangers.
Ninth Stage: Frozn. Berzerk surprisingly did well, especially if you got Kommandon Ld and included Taylor, Wagner and Jeffery in your deck.
Remember, you can't have more than a 25 star deck, but anything goes without penalty. As long as the characters in the deck are not from the clan you're
My other tip as you're going through normal mode, don't sweat not getting all the stars at once. Just keep going forward until you finish the fifth level. And then you can do back to get the other.