A mono-black deck won't have access to something like Golgari Grave-Troll, but it can still use Stinkweed Imp and Golgari Thug to give some punch to Songs of the Damned
Changelings and generic creature type support can all help to pad out the ranks of your deck, whether in the creature or mana base
This Grixis colored four-drop is also in my Commander Cube
----- Starfall Whenever The Lord Master of Hell attacks, it deals X damage to each opponent, where X is the number of noncreature, nonland cards in your graveyard
Combine this with cards like Strionic Resonator and cards that allow you to roll more dice, and suddenly Luck can be in your favor
Notably, this card triggers for each card drawn after the first, so if an opponent cast Brainstorm in Legacy, you will get three more triggers of both damage and amass