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Its a variation on Reveillark (although its just a dies trigger, not leaves-the-battlefield)
Take Narfi, Betrayer King for example and bring the reanimator commander back from the graveyard to avoid commander taxes
The key was Abuelos Awakening, the most efficient way to reanimate Omniscience, often as early as turn four
Lurrus of the Dream-Den is the most popular, and slots right into Orzhov decks that like to durdle or combo, regardless of whether hes a companion or in the 99
A dedicated UR build can load the graveyard very easily with self-mill and looting effects, so I could even see Eris hitting play around the same time as Stella despite the huge gap in mana cost