This is mageland only:

1) Strongly advising OG conjie if you can take an occasional death or two to RNG and don't plan to PK.
2) Second choice is something like defense/water/utility (pick two) shifter.
3) Definitely no air or off for shifters, but if you must do it, this is their rank
4) Muter would be a challenge IMHO. Not as much as a necro, but still a struggle to balance all the right things all the time, including groupies.
5) Don't do necro, you'll be miserable the whole way.

Including clerics:

1) Still OG conjie first pick.
2) Now druid comes to the second pick. But will be a struggle for a time to understand the phases and the herbs and such. Steep learning curve.
3) Defensive-minded goodie shaman would be my third pick.
4) Here's where we come to shifters and below from the first list.