Profet93 First off, thank you for being the first comment on this deck, and the first for any of my decks! I really appreciate it. So far Doubling Cube hasn't been the MVP that I wanted it to be. I still want to try it out for a couple more games, but I think it's on the chopping block. All of those suggestions were great. Murderous Rider, Blast Zone, Strionic Resonator and Command Beacon are all cards I intend to test out and will most likely find a home in this deck. As far as Necropotence over Blood Feast, that is a change I am 100% going to make. Again thank you for commenting and helping me better this deck!

No problem, I'm glad you liked my suggestions.

You have consume spirit, exsanguinae, profame command and torment of hailfire - not including your commander as X-spells. The weakest of them are consume spirit and profane command. The consume spirit lifegain is nice, only black restriction is sometimes annoying and only hits 1 player. Profane reads 1 player loses life and return 1 creature back. Both are not as good as exsanguiante and torment are the better X-spells. I would cut those 2 and add either some more draw or interaction.

Damnable pact is cool but unless you feel you are lacking draw, I would replace it with something less costly on life. Read the Bones, Sign in Blood, Night's Whisper and Syphon Mind. Read the bones and syphon would be my 2 picks.

If you wanted to add more interaction instead/with draw, then consider Mind Twist, Thought Distortion, Worst Fears and Force of Despair. Mind twist is brutal since the discard is random. Discard is one of black's strongest abilities aside from ramp and tutoring. This also baits counterspells. Speaking of counterspells, thought distortion can put in serious work depending on the meta. Shuts down blue completely, is partial grave hate and best of all can't be countered. Worst fears can just win you the game against another black player using their toxic deluge or necro. Moreover, you get all their information (hand, morphs, etc...) and can use their resources against them all the while depriving them of their turn. Lastly, force of despair allows you to interact while tapped out, very powerful to bluff interaction. I usually use it on opposing commanders or if my opponents get out field of the dead and a bunch of zombies in 1 turn.

Imp's Mischief- You already run this, it's one of my favorite black cards. Just note it changes any target, including but not limited to targeted..... removal, draw, extra turns and more. Moreover, it counters counterspells. You spend 20+ mana on your commander, just for it to get countered sucks. You could always add Cavern of Souls if blue is an issue in the meta (also helps magus) and can even be used on eldrazi for kozilek. But if that's not an option, in response to their counterspell on your commander, you cast imp's mischief changing the target of the counterspell to imp's mischief. Mischief resolves. Counterspell trys to resolve but fails to resolve since the target (imp's mischief) is gone/illegal. Your commander resolves, eating the blue player alive.

I saw you were upvoting my decks, you should check out My Deck as I am a mono black fiend. My deck revolves around interaction and tutoring (with all the good tutors) into coffers and urborg. Then use candelabra and others to untap coffers.

Profet93 I have actually found Consume Spirit to be aggravating with the restriction. Especially since I run so many colorless lands and dont always have the Urborg out. More interaction in this deck would also be nice. A lot of creatures and sorceries here. Its odd, but there aren't a lot of blue players at my local. There are however a ton of green players so I think something like Force of Despair would be a blowout for them. For sure I'm gonna try some of these suggestions out. Also that Imp's Mischief trick really suits that cards flavor, and I would like to add a Cavern one day but getting that foil is gonna be tough! One day, hopefully I will get one.

Sounds good. Be sure to update the deck with what you put in and take out when you are finished playtesting and what you feel the deck lacks, as well as your meta so myself and others who view your deck can better guide you.

Profet93 I plan on keeping this deck updated as I go along. Thanks for the help and I hope to terrorize my playgroup even more with these new changes.