User blog comment:JmLyan/Jace, the Mind Sculptor/@comment-6301771-20130409044137

Passive makes no sense, unnecessarily limits build options, and is basically a giant debuff.

Mana Leak doesn't do much, and mana burn is a mechanic Riot doesn't like playing with because of how unfun it is.

W has an absurd cooldown and projectile reflection is an awkard mechanic to balance.

E plays with an interesting idea but unfortunately doesn't do much for either a support or a mage.

Directly controlling enemy champions is next to impossible due to how League controls.