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Sheen made farming a lot easier. I am fairly confident in my ability to last hit without it. Now with the Ninja Nerf to Headbutt+Pulverize and the hits you could previously proc inbetween, its not even good to rack up damage on the enemies, so I rarely buy it unless I am solo queueing. Then I may still buy it. Sheen first is still not bad, extra mana, ap and damage bonus really helps in lane and to push down towers fast.