Of course this isnt really a new mechanic at all, just a reimplementation of the saga mechanic introduced with Dominaria (and later reintroduced with Theros: Beyond Death and Kaldheim)
Investment capital is limited, and the more of it you sock away, the less of it you have for quick flips and other short-term financial moves
A source of reanimation right in the command zone makes the deck far more consistent, something that reanimation decks can struggle with since the core combo often requires three cards: a card worth reanimating, a way to put it in the graveyard, and a means of getting it back
Cards in a deck cannot have colors in their color identity that are not in the deck commander's color identity
With Ashaya, Soul of the Wild, this lets you put a +1/+1 counter on a creature whenever a nontoken creature enters the battlefield
Protect Your Saheeli One of the traits of a good planeswalker is its ability to protect itself