Been experimenting with this today, and it's actually an amazing finisher in Mono-Black Midrange/Control.
By sheerly running him, he encourages the use of Liliana 3.0, which helps smooth out land drops, making it easier to cast him, but can also make him an OTK. Simply playing him and giving him Haste, then using Liliana's -3 is 10 poison damage.
Shame he's rotating soon, though. Means the fun is almost at its end. :c