I have found the best way to make coins for any lvl. ok so you make a low lvl then lvl it to lvl three. By that time it will have like 2,000coins on it. Thats enough for 4 turnys. Then in the turnys the nob acc joins and he runs to other side and lets them kill u. Once it at 0 coins you restart the process.
I believe that i have found a quicker way to lvl than a combo. Here's what u do, just make a death match room. Your lvl should be the max lvl and then the minimum lvl should be 0. Then once the room is full just own people. Since they are lower lvls they SHOULD be easy to kill.