You still have tools like Yuna, Hope of Spira and Kavaero, Mind Bitten to bring creatures back, but the deck leans more toward a value-based enchantment strategy with strong enter-the-battlefield triggers
Phasing out doesn't cause permanents to leave or re-enter the battlefield, so no "leaves the battlefield" or "enters the battlefield" abilities will trigger, and Kaito's first ability won't trigger again at the end of a turn in which he phased in
However, copies will have also been taken out of circulation by an interesting new Naya Overlords Standard deck that has started to gain a little bit of traction
2021 doesn't have a premier set like Commander Legends but has continued the pattern of releasing preconstructed Commander decks alongside every Standard-legal set
You either love him or hate him: Its Edgar Markov
I fully agree on not putting Sol Ring in this precon by the way - you have 133 pips to fix for in this deck and Sol Ring tapping for double colorless will not help in making you cast the large number of 5-color cards anytime soon, but if there was ever a time to reprint Birds of Paradise into a precon it should have been this one