I have a monoblock valgavoth deck. It is hard to get him out. With that being said if you get him out you pretty much win the game. This actively stopped craterhoof from winning in one turn. I highly recommend -x-x spells to board control as well as other big mono black threats such as obliterator. Dynamo and black market helps as well. I've gotten him out on turn 4, but my deck has a potential of getting them out and turn 2(command beacon and then having to discard down to hand size, then reanimate)! Nasty! If you like a challenge I think it's worth it.
