Hearthpwn

I don't really understand Stitched Tracker in this deck. Mossy Horror is very situational and Subject 9 only needs to be played once. Professor Putricide is the only obvious target.

Look at it this way:

You can only run 1 copy of legendary minions, right? But often times, you really want to draw them (especially in a deck like this where Professor Putricide is so incredible, or where Subject 9 is needed for more gas). Stitched Tracker is - in essence - circumventing around the legendary rule, by serving as a pseudo second and third copy of those minions.

Further more, for tech minions (such as mossy horror, in this specific deck) where you only want to include 1 in an effort to have a situational answer when necessary, but don't want multiples so as to not disrupt the synergy of your own deck's strategy...Tracker serves as a copy of the right answer at the right time.