User blog comment:Jake.butdorf/Obliviana the Elemental Archmage/@comment-165.111.2.149-20130227204317/@comment-68.54.61.82-20130227231056

Did you see the mana cost?

Cost per second: 250/250/500/500/600 Mana

The most it could go on for is about 5 seconds or so. And then you would have no mana and be extremely suceptable to the enemy Bruiser/Assassin

This ability would be primarily for use when you get turret dived or if your low on hp and have a chance to kill the enemy chasing you. Or even just take someone with you if you get ganked or chased by multiple opponents.