I was about to pick Saffira since I already have one (and I've already 2 Manju and 2 Sonic Birds). But heart choice, picked Red Lotus !
I advised Cosmic Cyclone to my GF, she's beginning in the game with spellbooks.
I dont think Spellbooks is a very good deck choice for a beginner, being among the most complex decks so far in Duel Links. Amazoness is more newbie friendly and more budget friendly as well.