Yes, that's the way to an universal caster. Start as a mage (fire and stone), become a paladin (spirit) then a ranger (vine) and now become a warlock. You'll be able to gain any spell in the game because you will know all magic schools and all these magic schools will be "yours".
Who should do such things?
1. A solo character.
2. A future enchanter/blesser. This character isn't supposed to be a mage and to cast spells around himself all the time. He is supposed to get all "Artifact of ..." spells and train blessing and enchanting.
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My name is Demon\'s Last Day. Yes, the last one.
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