No. 11 Ranked Player Alexander Hayne: "My personal favorite way is to cast big Sphinx's Revelations and out-draw them, using scry lands to keep your best cards on top of your library to keep them hidden from hand disruption.
No. 6 Ranked Player Shahar Shenhar: "I would say Dredge. Dredge is the best deck you can play to just beat Mono-Black. You could also play a Mono-Red creature deck. Staff of the Death Magus is not as insane against a Mono-Red creature deck as it is against the burn deck.
Grand Prix Minneapolis 2012 Champion Christian Calcano: "It's tough. Normally I'd say the Boros Burn decks, but the Mono-Black decks adapting with Staff of the Death Magus in the sideboard. I just think the white-blue control decks are the best way. They have a lot of answers for what that deck's trying to do.
Pro Tour Born of the Gods Quarterfinalist Tim Rivera: "I plan for the mirror. Erebos, God of the Dead and Duress effects. I think Mono-Black is the best deck so that's my goal.
Hall of Famer Paulo Vitor Damo da Rosa: "What I like to do is have very powerful cards, since they have discard spells and it's easy to get into a top-deck war against Mono-Black. Sphinx's Revelation, for example, is a card you'd want in a top-deck war since you'd be ahead in those situations. The other way to combat is to beat them very quickly, but now they have Staff of the Death Magus so that's kind of awkward. It's a hard deck to beat since it has cards that are good against everything. Maybe Dredge, since your guys are big and are hard to deal with, and they come back after they deal with them.