Rules glossary
↑ Parent rule: 702.124 Partner
702.124j “Partner with [name]” represents two abilities. It means “You may designate two legendary cards as your commander rather than one if each has a ‘partner with [name]’ ability with the other’s name” and “When this permanent enters, target player may search their library for a card named [name], reveal it, put it into their hand, then shuffle.”
No sub-rules.