Partner is an interesting new mechanic from Commander 2016. They have had one special commander-related … thing each year, but this is by far the most interesting. I don’t know how many we’ll have, but I imagine 10, one for each color pair, which are the main commanders for the this series.
I’m going to be working with [scryfall]Silas Renn, Seeker Adept[/scryfall] and [scryfall]Kydele, Chosen of Kruphix[/scryfall] here, because they are the ones spoiled in “my colors” thusfar.