Quote from shermanido37 »Liliana is an amazing commander, but she's most powerful when you don't rely on her. She can just be an amazing engine to power an existing deck.
My point is, you are depending too heavily on Liliana. Someone plays Nevermore on her and you don't have a game plan except for removing everyone's stuff... Eventually you will run out and become irrelevant or dead.
Instead, run cards like Crypt Ghast, Rune-Scarred Demon, Chainer, Dementia Master, draw a ton of cards with Night's Whisper, Read the Bones, Ancient Craving. Black can play the value game very well. Lili can be the cherry on top that dominates the deck, but doesn't have to be the one critical card you always need to have.