As longtime opposing mage/challenger of Borg (played the game since the very beginning but never posted a thing) I can say that this is an really scary book.
I mean really, really scary.

The Thoughtspores can hit you anywhere in the Arena thanks to Mind's Eye. You won't even get close 'cause the TS's keep moving. Killing Mind's Eye is more expensive mana- and actionwise then the FM just casting another one.
In the meantime you have to fight Alandell and sometimes the Forcemaster himself. Your creatures are ignored, brought down by Alandell or send running after a flying and moving Thoughtspore on the other side of the Arena thanks to Chant of Rage. One spell that is gone from the spellbook is Sleep, which was another counter to creatures (and cast by a Thoughtspore). What's the reason you excluded it Borg?

Being stunned once or twice almost equals defeat - you are behind on answers (contesting with four actions - 2 from TS, 2 from FM). I lasted long just because Borg's dice rolls sometimes downright suck and it was his first time with the book.
My conclusion: this is a book to look at! So much I decided to make my first post (and I think that means something Borg  ).