I just beat Dagon with +185 at the end of 3rd round. Discovered great combo . Got lucky I guess.
I'm using Henselt deck with Operator, Reavers, Summoning circle, Decoy, Neneke and Shany as main cards.
I'll explain only most important moments:
Key point for me was in 2nd round when Dagon player triggered all of 3 Dunn Bunner Light Cavalry(DBLC) and then used Nekker Warrior. I then coppied Nekker Warrior with Summoning Circle and used to get 2 more copies of DBLC, and again, with Decoy got 2 more.
In 3rd round I used Nenekke to revive all of previous 3 DBLC, then used Operator to make copy Reaver hunter (got 4 in all). Then I used Shani to revive Nekker Warrior and used it to create 2 more copies of Reavers (got 6 in all).
Dagon player triggered again DBLC (7 of them this time) with his Triss Butterfly and then I used Henselt as finisher on Reaver Hunters.
I was proud.