Spell Variations

So, my cool ole little suggestion is a variations in spells per class.
As of now, each class has four spells. Now, what if you could "forget" one spell and "learn" another for say, 4 soul points?
It's a bit of a price, but it shouldn't be looked for to farm and such, but to work other tactics. For myself, I reset my skills quite often to have specific armour and weapons, so why not perhaps the same thing with Spells?
There could be other variations so say you are an Assassin with the four given default spells. Perhaps you want to be more of a class where you can do many spells at once or something to set-up opponents. It could benefit you to have Smoke-Bomb, but then have spells that do simple attacks that take little mana. There could also be a cool down for this, like a 24-hour cool down or so. Your spell may be weaker, but with your plan, it can make you stronger than before.
I feel this is very possible. Could have someone like a Spell Sorcerer in Rymek. There could be a quest the player would have to complete before access could be given to use resource. The Spell Sorcerer could be a person who stays in Rymek to avoid the Province Militia and lives under Rymek in a bunker unknown to many. The Sorcerer could send you on a mission to retrieve some lost items of his to continue doing this spell work. These items could be but are not limited to a Wand, a Mythic Everlasting Pufferfish (So he can stay hidden underground), and many powders/potion variants. This would make the quest a Medium or Long length, which is worth it since you would be gaining access to this asset.

Let me know any feedback below. Cheers!

 

Sounds good but needs more detail

Also add a pool

 

i like the idea, but it should be used as a money sink rather than costing soul points

which are really cheap mid-endgame, when you die less