The requirement of controlling four or more creatures is pretty steep
If you only have grind, then you know the number of times it takes to mill someone out is directly tied to the number of lands left in his or her library, which can mostly be figured out by counting the lands on the battlefield
Best to take any of these for a spin in unranked play to get used to them first
Read More: The Best Mono-Black Commanders 2 Najeela, the Blade Blossom This is the point at which things get really silly, and Najeela, the Blade-Bossom is one of the silliest commanders around
Pillar Analysis: Unique Effect (Creature Tax), Scarcity (Legends, Reserved List), Format Staple (Legacy/Vintage)
This deck is no stranger to board wipes or a few ways to cheat creatures into play