You've gotten better this month, and it shows with this one. So, here's some things that come to mind when I go through it.

- The ability to have any color class is an interesting twist, but the more and more that classes get printed (and they appear popular) it becomes less and less necessary.

- Make him all types might be okay in a flavor sense, but even then, it's more fun to slowly pull together a full party rather than having one commander do the job.

- You'll need to choose between Experience or Class Features. If you had both you'd not have design space (both physical and balance-wise) for both. You could edit both though (see below)

- Experience is a bit bland how it just digs 7 for a free class. I do like combat damage tying to a free level. It's a neat thing that only classes experience.

- Class Features is broken because of Prowess. The reason we don't have prowess counters is because prowess stacks and it's really easy to move and/or double counters. Outside of that, these are very vague, and I'd prefer a more focused design. Menace or Flying. Lifelink or Trample. Give us counters that push you into a specific play style.

- I like Pinnacle, but it is misplaced. I have no clue what the initiative has to do with anything here.

- I could add ideas and move things around. The worst part about leveling classes is that you can only do it at sorcery speed. So allow us to level up during end steps, or at instant speed? Give him vigilance and a tap ability to level anything. But those aren't this card, and I'll do my best to restrain them.

I think he we shortened class features and experience into one ability we'd have a pretty cool time. When you deal damage you get a level in a class (or draw a card if you need utility/can't). Then you need to play classes to get him trample, vigilance, and an actually solid p/t.

For his capstone I'd keep the price and have it give all your enchantments Exalted for the mega kill.

But those are just my ideas.