The more of these types of lands you have, the better
Saheeli, the Gifted is a fine commander, with her ability to add a bunch of mana with her second +1 being especially scary, but she suffers from the fact that there are a bunch of artifact-based Commanders available, including the extremely powerful Breya, Etherium Shaper, so being "fine" might not be enough to pick Saheeli, the Gifted as your Commander over other options
As I mentioned before, the most powerful way to build Commander decks with MDFCs is to cut five or six lands (usually basic lands or other utility lands that tap for one color of mana) along with two or three spells and replace them with MDFCs so that you end up with something like 31 or 32 "real" lands but 40 or 41 total lands
From Amulet Titan to Yawgmoth Combo, Green Sun's Zenith is a card that easily slots into a myriad of strategies, so it's no surprise how popular it is
(Sad.) However, he gets to untap on each end step if you gained life in the turn