Well, an elf with 3 wpa will have 6-7 mod wpa, so your 10 mod wpa isn't that much better. It would be great if the formula for successfull casting is posted in the new guide, would be very helpful. But only if it came from omac and not some silly player with no idea and a copy/paste fetish.
At any rates difficult spells are difficult for a reason and I don't see anything unreasonable with MS being hard to cast on anyone willing to dedicate over 10% of their population to wizzards. Offcourse those with twice the mod wpa should have god successrate, but I can't help but think you should have to pay a bit (cost of mana) to get the most difficult spell thru someone who obviously master magic well.
a: Fog for all races is pretty much equivalent to increasing base attacktime with 3 hrs, forget it.
b: Rax isn't good now, ppl shouldn't use them and making them worse won't help
c: Casting MV successfully x3 will give 87.5% chance to remove a potential fog, it's a complete waste of a T/M if you're going to have him waste maybe 5-6 castings trying to remove a makebelieve spell.
d: elves has 30% wizzie eff and de has 30% stronger spells. Did you want a spell to do this?
Keep up the good work!