Whats the GIF from?

The Gif is from Tokyo ghoul. An anime about Ghouls. I'm a total weeb.

Expedition Map - I see you cut this card. I wasn't running it for the longest time because I was miraculously drawing Cabal Coffers/Urborg, Tomb of Yawgmoth almost every game, but in terms of potency it's almost strictly better than any mana rock in mono-black. Mid to late game seeing Expedition map over, say, Gilded Lotus, can mean increasing your potential mana stores by 6 in stead of 3, and lands are generally harder to get rid of than artifacts. This also brings me to...

Vesuva / Thespian's Stage - Double your own Coffers or copy your opponent's.

Corpse Dance - I'd run this over Makeshift Mannequin. Makes a great "at the end of your turn..." card, all it needs is mana and a sac outlet and mono-black isn't exactly hurting in that regard. You might not be able to pick your target, but that makes it resilient to targeted graveyard hate like Geth, Lord of the Vault and Scavenging Ooze and late in the game this card can reload your board all on its own.

Karn Liberated - Same reason you're running Ulamog; gotta deal with those pesky non-creature permanents. Exiles rather than destroys and it's reusable. The fact that his plus ability is +4 can make him a real hassle to kill too.

All Is Dust / Oblivion Stone - Best panic buttons around. Wraths that take care of your problem targets. All is Dust is especially strong as you're a little light on enchantments and sorta heavy on colorless artifacts, and the "sacrifice" component gets around indestructibility.

Hell's Caretaker - Sacrifice a zombie to bring back the creature you sacrificed to make zombies so you can sacrifice it again and make more zombies.

Bloodghast / Reassembling Skeleton / Nether Traitor - The critters I mentioned in the thread. Just really consistent little combo pieces that aren't dependent on something like surviving until your upkeep to come back.