You could always do the homebrew I did for my black company games: any class with a caster level is banned except for the adept. You can use non-caster alternate features if available. Only the immensely powerful and ancient sorcerers can reach the height of power of the true casting classes. Paladins may select the following alternate feature in place of their casting: at fourth level you emit an aura of antimagic out to a radius of 10ft. Each time you would gain access to a higher spell level, you instead double your aura's range. I.e. 20ft, 40ft, 80ft... because of this power the true sorcerers will hunt you, you must select this alternate at 1st level. From 1st-3rd level you are enwrapped in an antimagic field that only encompasses you.