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In singleton formats, that kind of precision is why you play it, no matter what MTG color combinations youre running (as long as it includes black)

It basically turns every land you play into Ancient Tomb for a turn while fixing your mana and really going off with fetch lands and multiple land drops

Thats a lot of hoops to jump through just to get a legend onto the field, but at least it lasts until your next turn, so cards like Jin-Gitaxias, Progress Tyrant have a whole round to punish your opponents before they revert back to whatever they were

The first list uses four, as it is literally an all-in God of the Forge deck, but I would guess that is more the exception than the rule

However, its advantages aren't distinct in Commander