Disclaimer: this deck is not that good. I got lucky with pairings, matchups and draws.
The core strategy is: get board control with icon-stripping stuff and retaliation, go unopposed to accumulate powers (no renown, u know). If something go wrong, try to valar and restart.
Gj and Stark are the best MU.
NW and Targ are the worst.
Pairings: BYE (from store), Baratheon F, Lannister Castamere, Lannister banner of the kraken, Martell banner of the wolf, GJ Castamere, Lannister Castamere, Stark F and GJ Castamere.
Feel free to ask questions.