This feline brings its elegant sneakiness to the battlefield with attacks that match its shady vibe
Its ability allows you to draw cards until you have 5 cards in your hand, which is a fantastic ability which helps make you immune to such disruption cards as Roxanne, as you can immediately refill your hand during your turn
I removed the following cards to make room for these changes: Academy Manufacter Windgraces Judgment Gourmands Talent Shamanic Revelation Arasta of the Endless Web Skyfisher Spider Wolfwillow Haven Plaguecrafter You can find the upgraded decklist here

Goliath Truck Grond, the Gatebreaker Guidelight Pathmaker Haunted Hellride Heart of Kiran Hedge Shredder High-Speed Hoverbike Hoard Hauler Honeymoon Hearse Hulldrifter Imperial Recovery Unit Imposter Mech Invasion Submersible Irontread Crusher Jackdaw Jetfire, Air Guardian Knight Paladin Kylox's Voltstrider Lifecraft Engine Lumbering Worldwagon Luxurious Locomotive Magicked Card Magitek Armor Magmatic Galleon Marauding Dreadship Marshals' Pathcruiser Mechtitan Core Megatron, Destructive Force Meldweb Strider Midnight Crusader Shuttle Midnight Mangler Mighty Servant of Leuk-o Mindlink Mech Mizzium Tank Mobile Garrison Mobile Homestead Mobilizer Mech Mole Module Mukotai Soulripper Mysterious Limousine N'Yami-Class Mother Ship Nautiloid Ship Necron Monolith Night Scythe Optimus Prime, Autobot Leader Ovalchase Dragster Parhelion II Passenger Ferry Peacewalker Colossus Phantom Train Phoenix Fleet Airship Possession Engine Prodigy's Prototype Prowl, Pursuit Vehicle RMS Titanic Raiders' Karve Rangers' Aetherhive Rangers' Refueler Ratchet, Rescue Racer Reaver Titan Reckoner Bankbuster Recon Craft Theta Renegade Freighter Ribskiff Ripclaw Wrangler Rocketeer Boostbuggy Rolling Hamsphere Rover Blades Royal Talon Fighter Jet S.H.I.E.L.D

The main thing I have against Mental Misstep is that there are many viable decks without any one drops and plenty more without any concerning one drop plays