kenjib:
I knew someone was going to say that. No, I'm saying that the combo is most powerful (broken/overpowered/etc) when it is done by 2 seperate casters. While 1 caster can do it, it reduces the effectiveness of the combo to the point where its a good tactic, but its not going to hose any encounters. Hence, its another reason the Myt is NOT overpowered.
Cedric:
Don't forget the pre-reqs for Archmage. For a single-classed wizard who has backup feats its not as big of a deal, but for the MyT (who is going probably want some metamagic feats because of the sheer number of slots, item creation because of their breadth of power, and the usual spell penetration, spell focus...) they are giving up a lot for that particular combo.
Oni:
While spectral hand + inflict is a good combo, take a look at the levels it is being utilized.
Clr3/Wiz3/Myt2
This gives us a 3d8+5 inflict (or cure), which if used via spectral hand (uses another round of combat to cast the hand) is pretty darned handy.
Of course a Clr8 can cast a 4d8+8 inflict using the turns-a-touch-to-a-ray feat or by just getting up close (having the hp and whatnot).
And a Wiz8 could cast the same spectral hand and then cast a vampiric touch for 4d6, gaining some temporary hp in the process. (Our Myt could also cast a Vamp Touch, but it would only be for 2d6 as it goes up per 2 caster levels).
So is the Myt overpowered or just handy? (in this scenario)
Technik