User blog comment:Emptylord/Season 3 - PBE Patch Notes/@comment-5170841-20121111055618/@comment-4948122-20121111092758

From what ive heard...its based on charges..at least on pbe.It has like 3-4 charges,gains one every second and expends one every second after you casted a spell...so it isnt that overpowered now.Even if it would be they can increase the price and change a bit the recipes.