User blog comment:Deshiba/Mana Items./@comment-24090792-20140921194744/@comment-4022742-20140922211915

I'm assuming you are referring to this part, well I bet there are better items out there that can provide defense or utility along side damage better then what I'm proposing.
 * "Gain attack damage equal to 2% of your maximum mana."

For instance, for a magic resistance item to out-scale, it would need to have 40 Magic resistance and 3000 mana. And that's without the passive damage of MaM, which would lift it to 4750 mana.

For pure damage types like assassins and marksmen there are better options out there.