Right now, Throne of Eldraine Standard is divided into Food decks and non-Food decks. If you're playing any non-Food deck, it's important that you have game against Food decks and also that you don't get splash-hit by the hate cards that everyone is forced to play.
The combination of these two factors means that black decks are uniquely well-positioned in this metagame. First, they have access to Noxious Grasp, which is one of the best cards against the Food decks and one of the few ways in the format to beat an early Oko, Thief of Crowns or Nissa, Who Shakes the World, as well as cards like Rankle, Master of Pranks which are hard for a Sultai build to deal with. Second, the black creatures are immune to Aether Gust and Noxious Grasp, which are frequently seen in maindecks at this point. A deck like Gruul Aggro, for example, wouldn't dodge either Grasp or Gust, which means it wouldn't be a good choice right now.
One potential shell for black-based decks is Sacrifice, whose main engine is Witch's Oven and Cauldron Familiar. If you have both on the battlefield, you can sacrifice the Cauldron Familiar for a Food token and then immediately sacrifice the Food token to return the Cauldron Familiar, which drains your opponent for one and gives you a free blocker every turn. The goal of most Sacrifice decks is to exploit this interaction even further by using it to constantly trigger Mayhem Devil, Trail of Crumbs, or Korvold, Fae-Cursed King.
There are four different approaches you can take with Sacrifice decks: Sultai, Four-Color, Jund, and Rakdos. Here's crokeyz's Sultai list: