A couple of things come immediately to mind: Storm World, while being excellent as an older card, affects you as well as your opponent. Without a way to reward you for low life, like Death's Shadow, I think The Rack and Shrieking Affliction are the cards you want. I don't think either are necessary though, because I think you could be all-in on the Unearth plan.
I think a package of
Faithless Looting, Unearth, and Pox-effects/creatures would be incredible. Smallpox turns into not only a control element, but an enabler of really powerful and efficient plays. Short list of potential playables:
Fleshbag MarauderFulminator MageMurderous RiderBall LightningHellspark ElementalBloodghast
I think you could have a dedicated number of hand disruption spells (Thoughtseize, Hymn), Smallpox, Faithless Looting, Unearth, and value reanimator targets (Krox, Skelemental, Marauder, Fulminator.) Once you round out the deck with PW's and some dedicated removal like Fatal Push/Lightning Bolt/Collective Brutality you should have a pretty cool Pox deck that has a grindy plan.
I think playing Blood Moon maindeck would be incredible, if only the format wasn't trending away from non-basic manabases. It's definitely a sideboard card until something big changes.