Wow, Tidecaller's Blessing on a Mage who has Void Staff, that's an awesome idea, I never thought of it before. There's me, always using Tidecaller's on my ADC, even in the late game. Maybe in ganks use Tidecaller's Blessing on a jungler if he has Hybrid Pen marks + Precision? I'm thinking it could also be amazing on a Nasus.

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Against an AP support like Morgana, I always try to buy Chalice of Harmony on first back, for the MR and because Nami can do some much more at levels 4-6 if she has mana. Is that wrong?

Edited: thanks for your detailed reply, I saw your PM :)

solid build. one thing i think could be mentioned is that switching to blue trinket mid game is pretty strong instead of sweeper

Why Dangerous game over Bandit?

I liked your guide, but you should add some pictures or bbcodes to make it more attractive(and less boring to read). Upvoted

You tell to pick Janna over Nami, but can you explain why. Janna has possibly more or better disengage, but i feel like Nami has a better laning fase, and has a more versitile kit overall.