I almost thought Midrange Zoo was dead, but it seems to be gaining popularity once again. The deck is very well-rounded and now adds Dark Peddler which can gains you some flexibility depending on the situation. The Voidcaller/Mal'Ganis combination is still super strong, and getting a free Doomguard on the board isn’t bad either.
Check out Herudra’s Aggro Zoo for a faster version of the deck.
It sucks when Void Terror pops out from a caller. However he is really nice to have in some instances. I would say that you drop one of the Dire Wolves and add the Void Terror if you wanted to. They both serve as an egg popper.
Why no void terror?