It was banned because it's a racial slur. It was always near the top of the list for any permanent banning. Mark Rosewater has gone on record about not printing it further because of this more than 5 years ago. https://markrosewater.tumblr.com/post/106100301518/
All seven recently banned cards are indefensible in both casual or competitive play.
All seven recently banned cards are indefensible in both casual or competitive play.