This is a commander cube I designed with some cards from my collection.
Each color is represented as follows:

70 Blue Cards (12 Commanders)
70 Black Cards (12 Commanders)
70 Green Cards (12 Commanders)
70 Red Cards (12 Commanders)
70 White Cards (12 Commanders)
80 Multicolored Cards (4 Cards and 2 Commanders per dual Ravnica Guild and 1 Commander per tri Guild combination)
49 Colorless
61 Lands
Total: 540 Cards

-The draft is supposed to follow as 4 packs of 20 cards, drafting 2 cards at a time.
-Every Monocolored Commander has "PARTNER"
-If you don't draft any Commanders, you can use "The Prismatic Piper" or "Faceless One" as one of your Commanders.