I'm honestly surprised at Fable getting a ban, since it seems like (from the outside) that Black is currently dominant thanks to Graveyard Trespasser + Sheoldred + Invoke Despair. Fable's strong, sure, but it's way more flexible than other cards when it comes to what decks it can slot into.
It's just that Fable is
so much value that the one-for-one removal in standard has a hard time dealing with it effectively. It's a very efficient card in a format that is currently quite durdly. I definitely don't think it's a ban-worthy card in of itself, but enough people are complaining that it's probably the candidate for the ban. I guess they could ban Sheoldred or Invoke, but Invoke actually leads to interesting deckbuilding changes and Sheoldred is a Mythic Legendary Creature, so both seem safe. As much as I think
Graveyard Trespasser is a boring and un-fun card, it's not so powerful as to warrant a ban, I would guess.
I could see Atraxa, Grand Unifier getting banned since she currently goes into a very powerful reanimator deck in Standard while also being easy to hard cast in Domain. However, I think that change might just make the RBx midrange decks stronger and decrease deck diversity for the moment.