Shadow Magic has 3 specs that use it Shadow Priest, Affliction Warlocks and Subtlety Rogues, theres also Discipline Priests who have a fair selection of Shadow spells at their disposal so thats 3 and a half specs for shadow repesentation,
If we're taking overrepresentation of cosmic forces in the classes Life/Nature magic has Druids, Shamans and Monks (Chi is just the pandaren word for spirit the same energy Shamans use and they have abilities that invoke the august celestials who are wild gods) who all utilize life/nature magic in some form. Meaning nature magic gets 10 specs to repesent it while most only get 3-4.