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I think if I were were to make a magic system I would also probably want to keep conservation of energy in mind.
All that fire and lightning and stuff is energy, and that energy needs to come from somewhere and go somewhere. And I think that could be used to create some fairly interesting lore and gameplay / story elements.
Like, maybe with such a system mages would charge themselves, for a fire mage for example in a sauna or in front of a fire or something, to absorb the heat. And they would need to be careful with how they spend this energy to not run out prematurely.
I would also imagine that the better a mage gets, the more easily they can handle energy, and the more they can have on them.
For example, and apprentice mage would have to sit in front of a fire, or something, while a master mage could just meditate on top of a bath of glowing coal for a bit.