I've been playing this deck quite a bit lately, and enjoying it. It is SURPRISINGLY effective, even though you feel like you are losing most of the game while you teeter on that knife edge... there have been multiple games I almost conceded only to limp along a couple more rounds and pull a win.
I've been really tempted to try slotting in a Enhance-o Mechano, but not sure what I could sub out for it... Was initially thinking Lesser Amethyst Spellstone, but there have been games I used that on my own minions to limp out of lethal against face classes for a turn. The deck I run also has Cult Neophyte, cutting one Spirit Bomb and if you play that well along with a timely Raise'd Dead and then Loatheb on 5, you can cause some inefficient plays from Mages and Warlocks that are really satisfying.
Edit: Off my work computer now, and yeah, something like this speaks pretty loudly as to it's effectiveness.