Hey guys! I made it to legend today using only mill rogue! Feels good to finally have it be viable without too much of a grind. I was around 65-70% winrate for the whole climb. I made a mill list previously, found here: Cloaked Mill Rogue [Guide] - Hearthstone Decks (hearthpwn.com)
I will probably update that list as well, but I thought I would make a separate deck just for keeping track of what got me from D5 to legend, if anyone else would like to try it! It is really fun to play and does quite well against the majority of decks.
Big/Reno Priest, Evolve/Big Shaman, Control Warrior, and Reno/Darkglare Warlock are the best matchups and usually a win.
Secret Mage, Kingsbane Rogue, and DH are the worst matchups, but not unwinnable.
Mostly favored matchups include odd paladin, any quest deck, OTK decks, and other reno decks (not warlock or priest).
Somewhat unfavored matchups include token Druid, Even Shaman, discard warlock, pirate warrior, odd rogue.
Let me know what you think, if you need help, have any suggestions, etc.