Compared with Teysa Karlov, Lavinia, Azorius Renegade, Judith, the Scourge Diva and Nikya of the Old Ways, Zegana is pretty disappointing, but I still think she has some utility and having 3 abilities rather than 2 somewhat makes up for her lack of raw power
With a storm count of 3, thats likely enough to win the game
Hold on to Prince Eric, Seafaring Prince to keep her safe, and plenty of the healing cards like Healing Glow and Julieta Madrigal, Excellent Cook , and you should be able to keep Isabela in play long enough to get you the win
This fits well in blue because, to maximize the effect, it wants you having a lot of other sources of card draw
If you can match your opponent card-for-card with generally stronger spells, eventually you are likely to come out ahead
That card and Academy Ruins are only about $15 each on average, so it's well worth picking them up sooner than later - especially for a deck like this