I saw a post online where someone created a new and pseudo-randomized way to play commander that I really enjoyed. The premise is this: I will create several 40 card decks revolving around the mono-colored partner commanders, plus an 18 card base deck that will contain generic cards. Each player in every game will then collect their base deck and randomly choose two other decks to smash into a 100-card, two-colored commander deck.
This is the base deck, mostly containing generic rocks and lands that will be good regardless of which commander you receive.