That being said, I think the reasons for a card being banned can be broken down into two main categories: A card is too powerful on its own and almost every deck has to have it to be good
Toxrill, the Corrosive Toxrill, the Corrosive is another horror commander, although unlike Captain N'ghathrod it doesn't care too much about other horrors in your deck
After all, if you just reveal Dragonlord Atarka, you are drawing eight cards and gaining eight life (not to mention having just gotten to scry 5)
If the creature these Auras are enchanting dies, the Aura will also be destroyed and go to the graveyard
Since your opponent cant do anything, theyre unable to deal with this 3000 ATK monster youve dropped on the board, essentially ending the game
Must be on to something there