Abomination is great glue. Good for fixing, midrange and reanimator.
Gladiator can smooth your draws as well while also being a discard outlet. Kinda love it.
Fledgling Djinn would be a nice add on for the aggresive black decks.
Wurm could be an additional fatty for green or a swap. Works good as reanimator / Natural Order target, is good with sneak attack while also being a realistic ramp target. Hounds not likley to make it to main, but I wanna keep an eye on discard outlets. Fatigue is just a little value removal which works with discard and self mill.