User blog comment:Tyrant Belial/Feral Flare tests/@comment-4636093-20140407152036/@comment-4636093-20140408092839

Skarner's only damage item should be ether Trinity Force or Gunblade if he goes Iceborn instead. If he gets Feral Flare then he can't use his Q to get that attack speed buff you mention.

And the Yi point is incorrect, Yi's Q with a SotEL will one shot the wraith camp, or 2 shot the wolves or double golem. Feral Flare is better against buff camps or the Wight, but his clear speed comes from his AoE. If you get Feral Flare then you will 1 shot each individual wraith,  and 2 shot each wolf or golem. Unless you also get Hydra in which case you're not getting any crit in your build which Yi needs.