I love the idea of the Praetors fighting for control and I want to create a cube that represents that. Assuming we wont see Gix taking control anytime soon I think new sets will make this cube possible. I am thinking of making this like commander except that you draft first and then you choose the Praetor based on your draft to be your commander. Here is how I am creating it:

Work in Progress

My rules for this cube:

1. No Yawgmoth cards. He's dead, but his legacy and cards that represent it are fine.

2. no infect. It's too powerful of a mechanic and not all colors get it fairly ...yet

3. All cards must have Phyrexian flavor

4. Being good or balanced is not a high priority