The really solid trick here would to combine extra turn spells with this, the red extra turn spells cause you to lose, but there are ways around that, like Platinum Angel or Sundial of the Infinite
Or in Karador, where you can repeatedly access the Awakening Hall side from your graveyard
I was critical of Atraxa for a long time, but I have since calmed down some, as the diversity of decks captained by them has grown past being almost entirely Superfriends
Youll want to load up on ways to get lands into your graveyard, including fetch lands, self-mill cards, and ways to sacrifice lands like Harrow and Sylvan Safekeeper
It doesn't provide the same benefit as Eerie Ultimatum, so it isn't really game-winning by itself
But if you want a strong Commander deck, you need a good commander, which begs the question: Which theft commander is the best