From a newb: I find spy decks for nilfgard to be annoying
They're simply the deck with the most synergies I have seen in this game, and unless your deck has a lot of "destroy your own units" or consume, it's a massive chore.
Between the ambassadors that boost their guys by 10 (12-2)
The Emissaries that allow you to get the units you want much more easily than other decks
The assassins that deal massive damage
Vicovaro medics that easily get back whatever they want to repeat their cycles
All of that synergised easily with Impera enforcers or impera brigade in almost brainless actions
Right now, I'm only level 17 and most of my losses I feel are from this type of decks. Even with a deck around consuming with monsters, I just can't get rid of all that crap. Most other decks have much harde to achieve synergies, with a lot more preparation. But to apply it, most of the time you only have to pop out your units.
I just don't enjoy these games at all, they are the utmost vomitive thing I can think of game wise.
I feel the disadvantage most of the cards provide by giving X or Y "points" to your opponent are massively compensated, and if the opponent of such a strategy surrenders a round to stop the snowball effect and to try to save some units, the Nilfguardian can just get the ball rolling again much more easily than any other deck. And there's no way really to break the spy abilities.
I may not be good, but the fact such a non enjoyable to face deck exists is simply ...