Hearthpwn

Spirit of the Rhino + Skaterbot = Give immunity to a mech.

 Spark Engine and Spark Drill can give you up to 6 Sparks, giving you one hefty Ozruk for Turn 9.

Void Ripper has 3 functions, first of which is flipping your high hp Ozruk into a potential 35/5, secondly it counters the 0 attack spirits by destroying them, and third it can be used to flip Meat Wagon to another threat especially if you are able to Skaterbot one to help thin the deck of cards lower than 5 attack.

Crazed Alchemist like the void ripper can do at least one of the above, useful tech for a situation where you and the enemy both have a spirit on board, but you dont want to kill yours off, requires you to wait out its stealth however.

Blackhowl Gunspire has a few synergies, it can be pulled by a standard stat flipped Meat Wagon or one with at least 4 attack through magnetic, it can proc many times off of Dyn-o-matic, and can benefit from Missile Launcher.

Woecleaver has some decent recruit targets with Akali, the Rhino, Blackhowl Gunspire, 2x Damaged Stegotron, and Beryllium Nullifier.