If your looking for two drops that are decent, Asylum Visitor might be a way to go, as it functions very similarly to Bob, and with your discard package you can actually trigger it on your opponent's turn as well.

Fatal Push seems really good here.

I disagree completely. Fatal push is very bad in this deck because it plays no fetch lands, this means revolt is very difficult to trigger.

in my own testing cast down is much better in modern than smother.

i feel that dismember is the obvious choice as it is played in every eight rack list, i t goes through indestructible and regenerate.

I think it’s a very good deck and I hope it plays well for you but why victim of night? If you switched it for Go for the Throat or something similar it could hit a lot more creatures especially if you’re playing another mono-black or black deck and it costs the same. Also I agree with the cutting some fatal push arguments. I ran a play set but have now cut it down to 2x in my mono-black deck because I wasn’t removing anything I controled So it was good if I had it opener but lost a lot of value later in the game against larger creatures where it becomes a dead draw for me

Dash Hopes is my fav black control card, though you'd have to use your own discretion on if its a good fit.