Now, I'm creating a mill deck and was looking at tragic slip for some removal. I have a question regarding the morbid trigger. If I milled my opponent for 4, and a creature was milled in the opponents graveyard; would the morbid effect trigger if I were to cast it? Any help would be greatly appreciated.
If you mill a creature card that creature does not die, since it wasn't even on the battlefield to be able to die. So no, the morbid trigger would not activate.
If you want cmc 1 black removal, I suggest going with
Disfigure or a tiny bit more expensive
Fatal Push.