Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Threats to Skarner with this build
Hey Summoners, I'm just someone playing around Platinum 1-2 and carried himself from Silver I to Platinum V in one week while only playing Skarner. I'm now playing him only this season with 75% win rate and consider him as free elo if the team plays passive in early game.
In comparison to other guides on here I play him with Flash and maxing E 80% of the games.
Here is why: The Flash R Combo in late game TFs is just too op and E because the stun is more like a free Warwick Ulti every 7 secs.
Additionally to that you can easily clean your jungle while staying around 60-70% of your health.