I've been having a blast with this seasonal mode, probably in my top 3 of all seasonal modes.
And it seems it's actually quite balanced between factions, with each going for different strategies:
-NG has Assimilate and tactics and Yen's Invocation, and seems like its one of the most popular, but i've had no problems beating it
-ST and SY have Gord decks and similar strategies with those elven sages and intimidate/crimes, respectively
-i thought MO was the underdog, but i saw an Arachas guy, who pushed me really hard R1, then again R2, almost 2-0ed me and i even had surrender and vissegerd to destroy a lot of his units, but basically you either have a ton of row punishment or Yrden or you lose, its the Kikkimore version of this seasonal
- SK has a lot of amazing alchemy cards, with revives and control (decoction and delirium), i can proudly say i didnt let a single Damien or Skellen i faced use his orders!
-even NR can do well, with necromancy and reinforcements giving crazy value, i used these with caravan vanguards and i saw an opponent use them with cintrian guards and it was one hell of a match.
You can also do some crazy stuff with sabrina's inferno and revenants, had an opponent do a board wipe on my side 3 or 4 turns, and i was putting 3/4 units each turn...