I also really like Vampire Hexmage here as a planeswalker assassin
Admittedly, I was among the majority who saw this Warp World knockoff and dismissed it as a bad bulk mythic during Magic Origins , but having seen what a Standard deck could do with it locally, this is another one of those board wipes that can easily be a finisher in the right Commander deck
Coram, the Undertaker Coram, the Undertaker turns mill into card advantage and even theft
As long as you're in a format where you can play Fetchlands to fuel your graveyard, it's essentially an upgraded Llanowar Elves that can heal you and damage your opponents without having to go through their creatures
It will get a few that you might not think of, such as Canopy Vista, Irrigated Farmland, Prairie Stream, and Scattered Groves