Mono-black gets to maximize Consuming Corruption and Grim Servant, but really takes off if you open key rares like Krrik, Son of Yawgmoth, Necrodominance or Shilgengar, Sire of Famine
This sheet gave R&D the scope to design a plethora of weird and wonderful cards without the usual constraints to consider, like the setting or flavor of a set or how overpowered they might be

Mary O'Kill Master of Cruelties Mauhr, Uruk-hai Captain Mayhem Devil Merciless Javelineer Mishra, Claimed by Gix Mishra, Lost to Phyrexia Mishra, Tamer of Mak Fawa Mogis, God of Slaughter Monoxa, Midway Manager Monstrous Carabid Moria Scavenger Mountain Titan Munitions Expert Murderous Redcap Neheb, the Worthy Nu and Sumi, Career Criminals Ob Nixilis, Captive Kingpin Obosh, the Preypiercer Ogre Siegebreaker Olivia Voldaren Olivia, Crimson Bride Olivia, Mobilized for War Orca, Siege Demon Orcus, Prince of Undeath Ozai, the Phoenix King Pavel Maliki Perforating Artist Prosper, Tome-Bound Pyre Zombie Rafter Demon Ragemonger Rakdos Augermage Rakdos Cackler Rakdos Firewheeler Rakdos Guildmage Rakdos Headliner Rakdos Ickspitter Rakdos Ragemutt Rakdos Ringleader Rakdos Roustabout Rakdos Shred-Freak Rakdos the Defiler Rakdos, Lord of Riots Rakdos, Patron of Chaos Rakdos, the Muscle Rakdos, the Showstopper Rankle and Torbran Raphael, Fiendish Savior Razing Snidd Rivaz of the Claw Rix Maadi Guildmage Rohgahh of Kher Keep Rohgahh, Kher Keep Overlord Rowan, Scion of War Rune-Brand Juggler Rushblade Commander Ruzic, Booed but Victorious Sanity Gnawers Sarcatog Sauron, the Lidless Eye Sawblade Skinripper Scarlet Spider, Kaine Seifer, Balamb Rival Setzer, Wandering Gambler Shadow Urchin Shady Informant Shagrat, Loot Bearer Shambling Remains Shauku's Minion Shivan Zombie Shriek, Treblemaker

Magic: The Gathering | Teenage Mutant Ninja Turtles Play Boosters contain cards from TMT and PZA
I still don't really know, it is certainly best as a combo card but it is not exclusive to combo
Bristly Bill, Spine Sower The word is out on farmer Bill as an amazing 2-drop, and landfall for pumping your creatures is incidentally good