In the update, the Commander RC banned Golos, Tireless Pilgrim from the Commander/EDH format. Golos was released in Core Set 2020 in 2019, and had actually previously been a problem card for the Standard format alongside Field of the Dead (see "Announcement' Date Moved Up"). The RC gave the following reason for finally banning Golos in EDH:
"Its presence crushes the kind of diversity in commander choice which we want to promote. You can drop in Golos and a few 5-color lands into a random deck and get all the ramp and card advantage you would ever want from a commander, with no worries about your mana base. Golos’ ability effectively reduces the commander tax to one and once you hit seven mana..."