Talk:Essence Reaver/@comment-14081808-20140823015400/@comment-24055932-20140825143513

Just take a quick peak on the stats:

With 300 AD and 2000 Mana, you will gain 300*0.02 = 6 Mana while spending 2000*0.03 = 60.

When you're down to 1000 Mana, you will gain 300*0.05 = 15 Mana while spending 1000*0.03 = 30

It's easy to see that this item does, at no point, "cure" Maramunes mana thirst. When having IE + PD and 300 AD, it should balance at about 700-800 Mana, but won't really refresh any mana. So any cast will drain you lower, and nobody wants to be that low anyway.

Basically, ER is only good if you really want the CDR and feel a bit better when you have a Manareg-ressource. That's why I'd advise it on Jayce if you want to play aggressive and all-in, though I always play him with tear ^^