Cards like Zo-Zu the Punisher, Vial Smasher the Fierce, or Rakdos, Lord of Riots are great with this Rakdos commander, turning the game into a real pain for everyone else
Lathril, Blade of the Elves Many players' first elf commander is still the most popular by far
You also want to be able to play non-black spells a lot of the time and this is a touch prohibitive
Alena, Kessig Trapper is the intended partner and does care about creatures with high power, but I can't help but want to jam some dinosaurs with enrage and get some extra triggers on Ranging Raptors, Urban Daggertooth, and Silverclad Ferocidons
Getting a free card each turn is very strong, especially if you didn't have to attack, or do combat damage, or anything else