Well, I'm about to take a long break from the game, so I figured I'd publish my favorite recent deck, in case anyone is interested. It's another prince deck, this time with dagmer as prince.
I had trouble making a prince deck with dagmer, since his ability is, though powerful,
1)not always relevant 2)forces you to not use claim.
I ended up thinking that 0 claim decks would benefit greatly from claim replacing effects such as dagmer and that scary building. The red wedding can be especially brutal, since the only lord in this deck is euron. The chair does require to use up the faction card, but I've found it to be worth it more often than not, Especially after you drop a vm and you're still able to kill.
Favorite thing about this deck, and what allowed it to give me relative success: You don't really need dagmer for it to work. He is a great anchor, able to steal important locations, even limited ones with assault, but if you get euron instead you might win even faster, and he can solo the entire board (why I had to include him even though he is a lord, and is in danger from red wedding).
Obviously there was the issue that the deck requires going first and all the plots are low initiative. I solved this with ubiquitous starting plot and a bunch of modifiers, including the new card. Seize the Initiative turned out to be a great one-off, and can throw people off balance. More than one takes too much space. I only brought one shadow shippie since it's a one time effect, bringing longships instead. It's still useful to have that extra edge for once.
Most common weaknesses off the top of my head: Really killy or kneely decks with an aggressive opening, choke, targ burn. Raiding Longship is prevents bringing the Greyjoy showstopper, so attachments can be a real issue. Political Disaster and Mad King's Command can be an autoresign. Fun thing though with this deck, it has the potential to beat decks that are a lot more competitive. Forgotten Plans or smth equivalent could be a good idea to face mad kings command.
It's really fun, very annoying for your opponent when you win (jk jk), and I believe it could have some teeth. I hope you enjoy it!