In Adventures in Oz: Fantasy Roleplaying Beyond the Yellow Brick Road (if you don't have it yet, check the links over on the right), the main way for characters to grow in power is to make friends. This certainly works for Dorothy, who spends much of the stories making friends with powerful people and then calling in potent favors.
But what about the Wizard? In his appearances in Wizard and Dorothy & the Wizard, he is firmly in the mode of humbug wizard, relying on tricks and gizmos to make it through. But by Road, he is shown using actual magic. How does AiO account for that?
I did include a rule that players could spend significant sums of Oz Points to permanently increase a character's abilities. But something occurred to me recently: Why couldn't we just say that the Wizard has Glinda on his Friends List? So instead of purchasing the Sorcery Trait, he simply spends an Oz Point to call on Glinda every time he uses magic?
It's actually rather cool that the game features multiple ways to do the same thing. Just like how the Tin Soldier could be built as a Crafted Person or a Soldier.