@companioncube2 try to use a wizard with the star staff thingy and put in 2 and maybe a couple of warriors (warriors must die). Since it's survival, you dont have to kill the big guy, just survive long enough. try not to hit him and he won't advance. Rest is a piece of cake.
The last few stadium races are ridiculous. there is no competition, there's one colour that wins every time by a mile. Any upgrade point recommendations btw?