Here is my one page RPG:
"I am going to be the greatest Wizard in the world, but now I am just a blacksmith's apprentice."
First things first:
Roll 1d6 for most things, 4+ is success
For things to do with Wizardry, roll 1d4
Roll 1d8 for Blacksmithing
Whenever you fail a Wizardy roll, take a Mentorship token, whenever you get advice from a person or thing, spend a Mentorship token to create a skill point. Skill Points can be spent to name a skill and get that skill at d6, or increase a skill from d6 to d8 or d8 to d10
You can replace Wizard and Blacksmith with something Heroic and something Mundane (barbarian/stable hand, knight/prince, healer/jeweler, amazon/bard)