Not only does it reliably and efficiently fix your mana, it turns into a near-Demonic Tutor with the only real cost being paid during deckbuilding
The slow lands are still good, though many have been reprinted over the years
You also get several legendaries: Shelob, Dread Weaver can act as graveyard hate on your opponents while also gaining some pretty great benefits if needed
With great artwork and flavor text on the original Urzas Saga printing, its no surprise that its a sought-after card that anchors a strong archetype in the ultra-powerful Legacy format that allows you to cheat massive threats into play way ahead of schedule
15 Jarad, Golgari Lich Lord The Classic Golgari Commander One of the most straightforward commanders on this list, Jarad, Golgari Lich Lord is a commander who wants as many creatures to be in your graveyard as possible
after this, just push down until you feel it click into place