Whenever Yuma, Proud Protector enters the battlefield or attacks, you may sacrifice a land
Maybe not every single one of them, but the average playability of these cards is off the charts

SAVE YOUR GPs: $50 PRECON UPGRADE SUGGESTIONS Out Fellwar Stone, Bucknards Everfull Purse, Sol Ring, Arcane Signet, Cloudblazer, Grave Endeavor, Revivify, Thorough Investigation, Arcane Endeavor, Plaguecrafter, Minimus Containment, Component Pouch, Clay Golem, Wall of Omens, Forbidden Alchemy, Extract Brain, Hama Pashar, Ruin Seeker, Rod of Absorption, Wand of Orcus In Priest of Fell Rites, Teferi, Master of Time, Nim Deathmantle, Dream Trawler, Lore Broker, Demon of Dark Schemes, Hells Caretaker, Archfiend of Ifnir, Nadaar, Selfless Paladin, Thought Courier, Enclave Cryptologist, Tetzimoc, Primal Death, Enduring Renewal, Barrowin of Clan Undurr, Yuan-Ti Malison, Fly, Reya Dawnbringer, Nezahal, Primal Tide, Taigam, Sidisis Hand These swaps will lock in that focus on looting over ramp and add more powerful reanimation targets, all while leaving a few dollars left over for upgrading lands or generic interaction

Ascend from Avernus White reanimation spells are often fairly limited, typically by the mana value of the permanents that they can bring back
Witch-king, Sky Scourge There's a lot of punishment dealt by the Witch-king, Sky Scourge
As for the actual deck it's leading, most players opt to go down the curses route with cards like Curse of Leeches and Curse of Stalked Prey