Partner (You can have two commanders if both have partner.) Other than the partner exception for Commander Draft events that use Commander Masters Draft Boosters (see above), the rules for partner haven't changed since partner's last appearance
Nahiri, Heir of the Ancients Nahiri, Heir of the Ancients comes with three useful modes for the Equipment deck and Warrior Equipment deck, all which you can use the turn you cast her, and none of which immediately uses up all her loyalty counters
While X spells don't always thrive there, given the prevalence of "cast without paying its mana cost" effects that like to cast them for zero, many consider ElectrodominanceElectrodominance worth the risk because it allows you to burn an opponent out with all the mana you've acquired from your rituals, then tack another spell on to continue the process for others
Social distancing wont last forever, and Ikoria will be Standard-legal until September of 2021
The only problem with the Urzatron is finding them in a 100-card Commander deck