Considering an interesting rule change that we all know Sheldon and/or Wizards would never consider, but hear me out.

The Partner mechanic (Not 'Partners with' just Partner) is changed so every Legendary Creature or other card that have a color identity of two or less colors now have Partner, the catch, all Partner combinations must have at least one shared color between the two commanders (With Colorless equaling Generic for the sake of sanity). Essentially this change would kill all of the current 4-Color Partner decks in cEDH (RIP Pod decks and Curious Control, you'll be missed), but would allow for some very interesting commander combinations. I might make a couple of decklists for my favorite ideas, but for now, here are what I would consider all the cEDH viable commanders that could be used for Partner combinations under this rule change.