... And all magic ultimatly comes from the gods.
That sounds good, works both whit forum physics and clasic fantasy tropes like divine magic.
There shuld probably be more levels than there are on forums thou, so you can have weak and semi-common magic.
Also, what about mixing some MUD/MUSH memes in, just a sprinkle for flavour?
A specifying suggestion, if tnME's one is accepted:
God: pretty much omnipotent unless contested by another god, but rarely interacts whit anyone else. 2-3 exist in the world.
Wizard: extremely powerful, can create stuff from nothing, bend space and time, exterminate armies whit a hand gesture, or other stuff along those lines. In difference to gods however, beneath all those powers they are still mortals, wich puts a limit to attention span and reaction speed, and in difference to gods they can easily I make errors. 50-200 exist in the world
Wizkid: "spell level" as powerful as a wizard, but only at a narrow area, so mind control OR time travel OR telekinesis OR near omniscience, but not all of them at once like wizards. 1000-10000 in the world.
Mage: Has diverse magic powers, but not as diverse as a wizard, and more importantly much, much less powerfull. while the raw power of a wizard or wizkid is near infinite and let them blow up planets or in general restructure parts of reality acording to their whim, a Mage is limited to "balanced" power, at abaut the same level as say Gandalf, mythological Merlin, or an epic level DnD wizard. 1000 000-10 000 000 in the world.
Super: Narow area like a wizkid, powerlevel of a Mage, you shuld see the system by now. 10 000 000-20 000 000 in the world.
Extraordinary: has one or several minor magic abilities, usually enchantments of natural skills rather than obvious magic. These are usually very weak in raw power, but sometimes when used creatively they can temporarily outperform some mages due to the greater integration whit natural skills, this is most common whit social or stealth related powers. 100 000 000-1000 000 000 in the world. these do not need their power to be granted by another magic user, their magic is usually not referred to as magic outside of technical discusion.
Normal: no magic ability. 5000 000 000 - 100 000 000 000 in the world. (yes, they got 20 times more pop than earth, but presumably the world(s) in question are 1000 times bigger.)
Racial: Into this category fall species which are unrealistic, but are not any of the above mentioned magic users.
Note that whit technology and effort a Normal or Extraordinary can become as powerful as a mage, or theoretically even a wizard or wizkid.
ok, this was just brainstorming, pick, chose, be inspired or reject as you please.
NINJAEDIT: AA: you may join.