This deck is TRIED AND TESTED!
I tested the general framework of this deck with friends (thank you Innate and Bodymassage!) and on casual mode. I just subbed the Lock and Loads for a second Kill Command and a second Violet Teacher (I used golden and non-golden cards and sort of pretended like the golden ones were the Lock and Loads, just to get a feel for how easy it was to draw into the Lock and Loads). The framework of this deck works really well. In fact I was really disappointed I didn't have access to Lock and Load a lot of the time when my hand was filled with cheap spells. The oddball cards you usually don't see in Midrange Hunter like Clockwork Gnome, Tracking, Loot Hoarder, Violet Teacher, and Antique Healbot still end up being solid cards.
(UPDATE: Added a Bear Trap and a Powershot and a Snake Trap. Bear Trap is awesome because it's a spell+minion, so is Snake Trap, and Powershot is just a really cool card because it's often like a 3 mana Consecration. Overall I think these three cards easily fit the theme of the deck.)
The deck holds up similarly to aggro as Midrange Hunter; in fact the ability for Tracking to draw into Antique Healbot is really significant and gives this list a better chance versus Face Hunter, and Violet Teacher gives this deck a good shot versus Zoolock.
Cards I included
Designed to draw into combo with Tracking and Loot Hoarder. Tracking of course doubles as a good card to combo with, but Loot Hoarder and Clockwork Gnome double as cards to stave off aggro with. Not to mention the Spare Part on Clockwork Gnome.
Piloted Shredder is just a really awesome card, no reason to not play it since this deck lacks minions.
Antique Healbot is a flex slot but if you want to survive against fast decks it's pretty important.
Violet Teacher is another flex slot but it's pretty goddamn insane with all the spell synergy so I think it's worth running one copy of it, the same way most Oil Rogue lists run a copy.
Cards I didn't include
I wanted to put in Arcane Shot but I couldn't justify getting rid of many of the other cards in my deck. Even spell heavy decks need board presence. Most of the other cards in this deck double as combo cards but also work well on their own, and Arcane Shot is pretty bad on its own unless the meta has lots of 2 health minions. All it really functions as is a cycle during your combo turn.
Instead of the Healbot I strongly considered Toshley for the Spare Parts, but I think Toshley might be too slow.
I couldn't justify really playing any of the currently revealed TGT cards because they all look too slow and inconsistent. Also Steamwheedle Sniper is a bit slow too.
No reason to run too many bad crappy spells. You just enough to make your combo turns good.
No reason to play most big minions or even beasts like Savannah Highmane because Lock n Load is your win condition and draws you into beasts.
Philosophy behind my choices
In order for the deck to be consistent, the deck needs a win condition vs control and a win condition vs aggro. I think most of the cards I've considered can double as both.
A lot of the card choices in this deck are built to replicate other successful combo decks like Miracle Rogue, Oil Rogue, and Patron Warrior, but still leave in some of the most successful elements of current Midrange Hunter lists.