It can swarm and win quickly like an aggressive deck, it can control the pace of the game, grind out value and operate like a midrange or a control deck
House and Preston will let you customize the deck with non-Fallout cards most freely, in either dice-rolling or enchantress, but otherwise The Master, Transcendent is probably the most splashable in general for Sultai decks
Overall, Fabled does a lot to move the game forward and pave the way for future sets
Jiminy Cricket, Pinocchios Conscience is an amethyst card
Most companions can be acquired through the Mastery Pass, with each new set providing new companions
Really, the only reason I can think of that this isn't further up the list is that Pir and Toothy became so ubiquitous as a "you can't let this person play Magic " kind of commander pairing that people got a little sick of it and moved on to browner pastures