Concerning your other query, If all the above mentioned Montanas are at their highest LvLs, you have 10 stars to spare on the rest 4 cards. If you want to play offensive or counter-attacking, choose the Uppers, Ulu Watu or Bangers. If you're defensive, go for the Sakrohm.
The Urban Rivals team is made by lovers of all kind of Collectibles Cards Games and Trading Cards Games like: Magic the Gathering, Dominion, Vampire, Yu-Gi-Oh!, Pokemon, Wakfu TCG, Assassin Creed Recollection, Shadow Era, Kard Kombat and Might & Magic Duel of Champions.