I always did 5mill stakes, I did mage only and range/melee only fights.
The trick with mage is in obstacles, you barrage them, the stand on top of them, so they cant attack you, then you keep casting and after each cast you instantly walk back on top of where his standing, it was one of the best staking tricks.
for Melee/RAnge, most of the time they would use melee and i would use range, all i had to do is get obby rings ( yes, best part because i disable shields, and they think they will win), then i hit them, i run AROUND to the other side of the forfeit box, and range them over the forfeit box. The funny thing about this trick is when you run around, they get stuck on the other side, so if they wanted to attack you, they had to manually click back to get back to you, I honestly wish they brought it back.