This deck has no spells except Luna's Pocket Galaxy. This way you can almost make sure you draw the spell with Raven Familiar. After using Luna's Pocket Galaxy every card is 1 mana and you can roll a lot of minions on the board. Especially with Stargazer Luna* and or Aluneth. (also the combo Luna's Pocket Galaxy and Archmage Arugal is Nice.
Brann Bronzebeard is there because there are 11 (brann useful) Battlecries.
An backup plan is to use Brann Bronzebeard with Baleful Banker and Manic Soulcaster to get infinite card draw, what can be handy after using Aluneth. See idea from Cybrosis ''Dane's Infinite Aluneth Mage''. But its just a crazy backup, and the cards are good to use other ways to, so i don't keep reserve them.
The big minion are just to take control after the combo's. They are just some i think are good but easily to replaced for other big minions.
I wonder if Prince Malchezaar would be good it in and will test that. It could be a nice way to have more big minion to roll, and dont be to fast out of cards. I was thinking of replacing it with [Kabal Chemist, my least favorite. But the problem is it will lessen the mana curve and i have a battlecry and spell less, the idea of this deck. I could also replace it with a big minion. (love your idea)
Im still working on this deck and love to hear some ideas for this deck!