Commander Masters is Magic: the Gathering's first Masters series set designed with the Commander format in mind. It's the second Commander product that can be used in booster draft Limited. MtG players will have a lot to juggle when drafting Commander Masters, such as finding the right legendary creatures to lead their decks and following the built-in draft archetypes. Two-color legends can ledae these decks, but so can a pair of mono-colored creatures.
Source:https://www.cbr.com/mtg-commander-masters-partner-ability-remade/