I really like Marvel Contest of the Champions, but all the information about this game is on forums. I find that the developers from Kabam want to keep some information a secret. And the information on GameFAQs is almost always outdated.
So, how do I keep a streak on 3v3 arenas?
Edit
Question refers to 4* arenas.
Best Answer
I have found another method, which is a compilation of all the methods I've seen so far. My goal is never use units to look for other opponents. I don't use sandbagging anymore.
From battle 20 and on I just keep my team total PI over 4200 (with no synergies or boosts).
This is not the fastest method because if you don't have enough teams of 4*s you'll have to wait for their cooldown.