I really love this fourth draft! It seems to have a lot of reasonable checks and balances while still being very flexible!
A wizard capable of 5th level spells can grant perma-flight to all the party for the reasonable cost of 1 attunement slot each (and some money)
Or himself can be perma-invisible or perma-blurred, have a permanent unseen servant, etc
Question: what if the caster is able to cast spells from another class (like from the druid or cleric list)? Should those spells be allowed to be made permanent this way?