So, basically you want to reduce the cost of Mecha'thun with 2 Galvanizers to 8 and then your combo is, once your deck is empty and you have only Mecha'thun and Goblin Prank in your hand and nothing else on board, to play them and click end turn.
There are 2 possible problems I see with your deck - first, does it draw consistently fast enough through your deck and second, what if you get 2 of your combo pieces to choose from those Trackings you have included? You basically can't afford to lose anything.
Historically, hunter is an midrange aggro class with tools to finish the game fast (hero power definitely helps). So, I am not sure how this deck will perform at card drawing, board control and survival till the late game. Yes, you have some nice spells to do that and Zul'jin will cast them a second time, but isn't it better to direct them at the enemy's face and kill it that way? I believe you will have hard time against all those hyper aggro decks like Token druid and Murloc shaman, hard time to remove the big threats that Mech paladin and Khadgar mage can make on the board and even hard time to draw through your deck with all the bombs that may or may not tick there (your only healing is Zileax and some armor from Zul'jin).
But, at the end, the most important thing is to have fun, so if you do, then by all means, unleash this Mecha'Thunter on them alll.