With the loss of Emrakul in Standard and the rise of the supposedly Black Green Constrictor-based decks, non-Blue control archetypes might have the chance again to get a slot in the metagame. One of which is Black White Control which was very popular back when Languish was still legal. Now it was replaced with Yahenni’s Expertise as the new Black sweep spell. The minus 3 minus 3 might look a bit inefficient to deal with large creatures but with its free spell bonus gains you a free spot removal and even a Liliana.