Once you reach the phase of the game where you can afford to do multiple things per turn, you need card draw to ensure you keep having things to do (Circle of Power, Fight On!, Travel the Overworld) or at least cards which can be used multiple times (flashback spells, Ring of the Lucii, Shambling Cieth, Relentless X-ATM092)
Theres just one Emily Quackfaster Level-Headed Librarian in the pre-built deck, getting three more shouldnt be too hard, as shes just an Uncommon
6 Kefka, Court Mage Players Will Be Dancing Mad When The Clown Enters The Field Discarding can be a major nightmare in Magic: The Gathering, especially when facing something without a lot of drawing power, like a blue deck
The cards that really stand out in this deck are Ariel and Isabella
Tap Arcane Signet to add one mana
Azurite Sea features more gain lore cards than any other set