The lack of red mana in this theoretical deck puts a limit on the number of Final Fantasy Wizards you can consider, but theres still Venat, Heart of Hydaelyn, who lets you draw a card every time you cast a Legendary card
The White, Blue, and Black (or Esper) deck for Final Fantasy is built around Y'shtola, Night's Blessed, who incentivises you to cast multiple noncreature spells with mana value 3 or greater in a single turn to drain your opponents and draw cards along the way
Slayers Stronghold ($2) This is in a lot more decks that you think, and aside from the SL version thats all in black, one of the only special versions out there
But that's not all that appeals - Stitch makes an excellent addition to any Amber deck that could use a bit more card draw
Astrologians Planisphere might actually fit well in a more tempo or artifact-heavy UW build, possibly with Cryptic Coat in the mix
Each players turn has two phases - the Beginning Phase and the Main Phase - and must be completed in full before play passes to the next player