To systematize the mechanics, a system of tags is created, similar to physical debuffs and magical debuffs.
Honestly, I don't understand what the purpose is of us continuing to discuss this topic. Let the GM simply decide how he wants those mechanics we talked about to work, and that's the end of it. And besides, since the GM is offering the Shaman compensation, he can decide for himself whether he wants to stay with the unchanged/changed spell, or not.
That's all.