Talk:Tear of the Goddess/@comment-112.200.213.100-20120215175807/@comment-1494173-20120215180342

Ezreal was made back when having the AD Carry in mid lane was the meta, and his recommended build has not been updated since, while the mana costs of his abilities has. I think they wanted you to get it because Ezreal has easy to spam moves and can can actually get the full effect of Manamune (both the 4 mana from using an ability and the 1 for auto-attacking) if you land a Mystic Shot. They probably thought it was good on him for the same reason people think Manamune is good on Urgot: AD Casters need to be able to cast their spells.

Regardless of all of this, I agree with you completely. Manamune is a horrible item on Ezreal, and unless you get fed enough to get it and some other items, it's not exactly worth its price. Even then it's not really worth it. I think that the AD earned from mana needs a bit of a buff.