User blog comment:Tyrant Belial/Feral Flare tests/@comment-4636093-20140407152036/@comment-1330314-20140408100922

I'm not. Yi doesn't need to use spells to clear camps with a Feral Flare, and rapidly gains the ability to two-shot even buff camps with it. Even on the wraith and wolf camps, the on-hit effect trumps the 15 extra AD SotEL gives by an extremely large margin.

And Gunblade is a terrible item on Skarner. Only his ultimate is single target, and the slow is less powerful than his E. You'd be way better off picking Feral Flare if you want to complement Iceborn Gauntlet. Trinity Force is the clear winner here, but if you're going for maximum clear speed you're actually better off picking up Feral Flare, again because of the on-hit effect, which also has the advantage of being far cheaper than TF (by 2053 gold), producing more gold (so Skarner can buy a Trinity Force and a Feral Flare) and eventually outscaling the latter in terms of DPS.