Hey dunno if this will help but I currently think of blue as my main deck since the expansion. Blue used to be heavy on the magic damage but the change to the base set of cards has changed that, I currently run blue as a melee deck deeplurker and flying squid are really strong and depending on what cards you have djinn oshannus or Wave brood make really good tanks. Serpent of Eld is still the best in the base set. Another thing that helped me getting used to this current meta was getting xenith monk to level 2. He gets Heal at level 2 and makes a good low cost tank, plus you can use him in any color. Anyway here’s a picture of a pretty typical lineup in blue for me right now, and it has a really high win rate so far. I’d say like 70-80% of games. Hope this helps and good luck in the next one.