[Ranylyn]

My only complaint is with Explosion immediately exploding with Nerhaven. A lot of the time, you'll be using Nerhaven to squeeze that Extra Power out. Explosion works well as a "trap" or sorts. To dissuade people away from moving into a space, or to hit a weakness between rounds to get +1 momentum next time. This would murder explosion for me, which is my favorite base mage spell.

I like all the other ideas.