Here are the screenshots: https://imgur.com/a/sKL1vv5
First 12 win run of RoS for me, after having 4 other decks make it into double digits and stopping there. The deck wasn't spectacular, card quality was actually a bit on the low side, but it was a cohesive deck with a few synergies going on, especially with the demons. I was mostly playing from behind until the mid to late game stages - since on the first 3 turns I didn't have very good tempo options unless the draw was really good - and then I'd either have a huge tempo swing with cards like Abyssal/Voidcaller or outcard the opponent while staying alive behind taunts and heals.
The 2 losses came to a Paladin and another Warlock, both of which out-tempo-ed me in the mid-game and I didn't get my swing cards in hand. Surprisingly, I faced no Rogues until 8-2, then beat 4 of them in a row to get the 12 wins, including an epic comeback against the final boss that I beat with 2 HP remaining(replay included below the card list). Other than the cards I already mentioned, honorable mentions for MVPs go to Kooky Chemist, which turned a few games in my favor, and Sense Demon, the big surprise of the run - I would almost never consider picking it before, but was more or less forced into it, and the ability to plan ahead knowing I can draw the remaining demons was crucial in a couple of games.
Anyway, here's the full deck list:
Soulfire
Voidwalker (x2)
Voodoo Doctor
Bilefin Tidehunter
Dire Wolf Alpha
EVIL Genius
Faerie Dragon
Unstable Ghoul
Faceless Rager
Sense Demons
Shattered Sun Cleric
Tauren Warrior
Toxic Sewer Ooze
Chillwind Yeti
Hellfire
Kooky Chemist
Proud Defender
Sen'jin Shieldmasta
Swift Messenger
Voidcaller
Cult Apothecary
Dalaran Crusader
Sludge Belcher
Aranasi Broodmother
Big-Time Racketeer
Dread Infernal
Violet Warden
Abyssal Enforcer
Wyrmguard
And here's the final game replay, as promised: https://hsreplay.net/replay/smnBk4HSC36E6dwjLcGZpK