Hearthpwn

 Hi, im Nalguidan and i want to bring you the mech rogue i played this season to climb legend combined with other decks, and then climbed to rank 50 middle season (i have no screenshot since im currently higher than that but you can see me play it in high ranks on the video i will upload soon) the deck isnt entirely new but has a lot of changes and its really consistent and fun to play.
 Being a mech deck doesnt mean its aggro like mech mage, this rogue sometimes have an explosive start, but also work if you get a good curve on high cost minions.

Gameplay: (sorry this is in spanish, im from Argentina and i made it to my team channel, if you dont understand at least you can watch my decisions)
Link: (its a playlist with a few games)  https://www.youtube.com/watch?v=mlcsQ-UHHg8&list=PLwFEUO5Mi2uFAdL9DxiZA9H07i0fd_pEC 

Popular matchups and mulligan:

As general mulligan you want to keep Cogmaster, Mechwarper, Anoyotron and Deadly poison vs most of the classes, also you want backstab vs agro decks and you can even keep harvest golem if playing vs slow decks. If you already have a 2 drop you keep any 3 drop but Agent, wich you only want if going second or having backstab.

Hunter: Rogue is favorite to win unless you get an awfull start, face hunter should be harder but you should win if you can stop them early.

Warrior: Like the old zoolock you overwhelm them with early minions hoping they dont have every single answer, and if the early game fails, you still have your big treaths.

Oil rogue: Easy matchup unless you have slow hand and they manage to get a good tempo adventage with sap. Loatheb, dr boom and ragnaros are amazing vs oil rogue.

Mech mage: Whoever gets the better starting hands ussualy wins, the rogue have better mid/late game but mage ussualy manages to end the game with spells even if you have the board

Combo druid: Every deck with mechwarper should be good vs druid, i think its the best matchup for this deck

Card replacement: 

The mechs are pretty much needed, you can replace 1 or 2 for something with similar cost.

If you are facing a lot of aggro/early decks i recomend to replace an azure drake or sky golem for a second cogmaster, maybe a healbot too.

If you dont have some of the big drops you can use Gallawyx, Sylvanas, or even Sprint to refull your hand