Whether or not well see this mechanic later on other planes is currently unclear, but there doesnt seem to be any problem with it balance wise
1 Falkenrath Noble
I think Ad Nauseam goes from grotesquely amazing to extremely prescient when you visualize that poor creature as someone doomed to only read and copy plagiarized work until the end of time
They also have a big old chunk of text that reads, Whenever another creature dies, or a creature card is put into a graveyard from anywhere other than the battlefield, or a creature card leaves your graveyard, Syr Konrad, the Grim deals 1 damage to each opponent. That means that your milling is killing, and you can just be chilling
Instead, this deck uses Moonmist to flip Aang early, while not worrying about his cumbersome cost
Check out the full spoilers for the Secrets of Strixhaven Commander decklists on Wizards' official website when you're done so you can get the full picture