Archetype: Tempo Midrange
Skill Cap: Average
Arcane Giant: With so many Spells generated or played in the deck, they will usually be played for free or nearly free.
Raven Idol: 2 Spells in a single card.
Harvest Golem: Mainly to increase the consistency of Tinkertown Technician's Battlecry, since the Damaged Golem summoned by the Deathrattle is also a Mech. Also has decent synergy with Mark of the Lotus.
Gazlowe: Included for fun. Another outlet for the 1-cost Spells and Spare Parts.
Yogg-Saron, Hope's End: Since we will be playing a ton of Spells.
Malfurion the Pestilent: Generally strong card all around.
Claw: Decent 1-cost Spell.
Feral Rage: Very flexible card that can be used as healing or removal.
Swipe: Board clear.
Emergency Coolant: Great for Freezing a big minion until you have a board to deal with it. Can alternately be used to stall against Aggro.
Rusty Horn: Great for stalling against Aggro. Can be cast on an enemy minion behind Taunt to attack into it.
Whirling Blades: One of the less useful Spare Parts. Allows your tokens to trade up into bigger minions.
Time Rewinder: The least useful Spare Part for this deck. Can be used as a way to restore a friendly minion to full health (by returning it to hand and replaying it), especially on an Arcane Giant (since you will most likely be able to replay it for free).