Since the deck is heavily focused on Equipment, most of the creatures and artifacts are ways to support Equipment or are Equipment themselves
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
Now they are mostly played for style points and for the obvious snow reasons (Marit Lages Slumber, Dead of Winter, Jorn, God of Winter, etc.)
Having only been reprinted once before, its unlikely that Dockside Extortionist will fall too much now its on the list
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
For players looking to expend that gas, Ledger Shredder is the obvious choice