Secret Mech Paladin is a solid Tier 2 deck right now in the Rise of Shadows meta, but it is flying under the radar a little. Much like the full-cost version , this list takes the powerful new early tempo secret-synergy cards Sunreaver Spy and Mysterious Blade and supports that early tempo with a strong midrange mech package. Although it's missing a few big legendaries, it can still dominate early boards and leverage that for tons of mid-game pressure that overwhelms your opponent. This isn't a Legend deck, but it can deliver some decisive wins in lower ranks.
Here's a video of me playing this deck:
You can also watch me play this budget deck and more on Twitch below: