Quote from JKlimek.
CM Wiz is probably the cheapest to do MP10 because with the freeze you can pretty much ignore EHP past a certain point and your DPS doesn't matter since you have them frozen the entire time anyway. It might not be fast or efficient, but see the above point.
♫"...Critical Mass will cost you some cash,
And if you're looking for some advice, you've just gotta ask,
And if you find our advice a little too rash,
Pick another build or maybe choose a new class..."