You can only partner these commanders together, as the text says PartnerCharacter select
Commonly those are keyword abilities such as hexproof or horsemanship, and keyword mechanics such as morph and mutate that are essentially tweaks that reimagine how already existing card types interact with game rules
The description is split in: [Level of the Monster] , Effect that activates if it's Normal or Special Summoned / Level of the Dragon it can Swap with
If this card is Xyz Summoned: Return all other cards on the field to the hand
Sultai Mutate: The Sultai Mutate deck is at a natural disadvantage for out-of-the-box play simply because its face commanderOtrimi, the Ever-Playfulneeds a bunch of mutate cards to be powerful, and since mutate is a new mechanic in Ikoria , there aren't that many mutate cards in an absolute sense (especially compared to other Commander 2020 themes like Humans or cycling)
Archangel of Thune is a five mana White 3/4 with flying and lifelink