Minor updates:

Blinkmoth nexus was removed and Magosi, the Waterveil was added. Secondary plan for combo ignition.
Everflowing chalice has been also re-considered. Its mana storaging feature will be taken by Saprazzan cove and/or Sand Silos, while mana boost will be provided by Expedition map. Those two lands have been proven useful with Winter orb seasons...

Echo mage remains in the deck.

Tamiyo, the Moon Sage will be added to the deck as soon as possible.
+1 ability is very useful since it acts same as my tapper wizards - either locks mana, or prevent creatures from attacking.
-2 drawing spell for 5 cmc at sorcery speed which will most likely provide more than 3 cards when properly cast. No matter if Tamiyo survives or not.
-8 Alternative to Elixir of Immortality. Bit more complicated but with immensely more strenght.

Mana web this evil artifact once again got my attention when in all recent games Urborg, Tomb of Yawgmoth entered battlefield.

Barrin, master wizard has proven useful, but to be really functional it needs Gilded drake or Sower of temptation. In singleton format its not very viable... Stealing of creatures was also aspect which I found most interesting. However when it came to cards like Damping Matrix or Humility I was still stuck in a lock (unless MOM+Stroke was ignited successfully). At all he will most probably leave this deck and other control mechanic will take place.

As long I want to play Tamiyo's ultimate ability bit more protection is required. Opposition is one possibility. However most likely it will be activated during combo. There are few methods. Viral drake, Inexorable tide or more likely Clockspinning which can be used to keep enemy planeswalkers under control... Other way is infinite turns - which is Savor the Moment or Magosi, The Waterveil already.

However there is one drawback... Tamiyo is almost intutorable in my deck.