Hearthpwn

Ever since seeing the Sharkfin Fan reveal I wanted to make another Genn Rogue deck like the Genn brew I reached legend with during WW.  I toyed around with a deck involving Dragons, Mountain Giants and draw power at first only to find out that random Rogue spells from Firetree Witchdoctor are often terrible even when discovered, and that aggro decks didn't care at all about Mountain Giants.  I thought all hope was lost.  Then I realized I pulled Da Undatakah.

I looked up some of the best even deathrattle effects for him - Arfus, Mechanical Drake and Replicating Menace - and knew what Genn Rogue's new archetype would be: mechs!  Galvanizer and Coppertail Imposter were easy shoe-ins, one Upgradeable Framebot helped fill the 2-drop slot and I threw in a Steel Rager Missile Launcher just for grins.  The deck practically made itself!

12/6: I've only climbed back from rank 21 to 15 so far - I took a hiatus from Standard last expansion - but the deck seems very solid and fun.  If you want to take it further yourself, be my guest!  I will be going on a huge hiatus for Smash Ultimate and thus will rarely log back into Hearthstone for a long while.  Best of luck if you try this deck out!  Feel free to brew it more yourself as well - there's no guarantee that this is the best version of the deck for this meta!