I don't see why you're using Varolz as your general instead of Skullbriar, the Walking Grave if you have no large, low casting cost creatures to scavenge. Skullbiar immediately attacks, costs less mana, and is pretty hard to remove, as his counters stay on him anywhere but your library or hand. Varolz is good in a different context, where you are playing creatures such as Phyrexian Dreadnought or Death's Shadow, and ways to get them dredged into the graveyard. See exhibit "A": Tiny Golgari, Varolz is all the 'Tron' you need. I think that there is a lot of potential in adding infect to varolz, and then slapping on a pair of Lightning Greaves or Swiftfoot Boots, but you have the context wrong. Just a thought.

@malfeischylde I'll build the deck and try both as commanders to see how each one plays out.

Ah, I see. You didn't try yet. Just think on both of their abilities. Varolz is meant to scavenge huge creatures, while skullbriar is just uber aggro. You'll see the difference.