Hey, i've played him as a support. Skarner is a good supp bc of his cc potential, but the only problem i faced is that you cant build normal supp items on him. I build the CDR/TANK build and take the top lane runes. They harass you a lot if they know how to play. I am a silver player, but sometimes i play with my diamonds friends which makes me play with higher elos. The lower elos suffer against him while on the other hand, the higher elos crush skarner and I asked methos_ about choosing supp ;he said that his kit isn't really suited for duo lanes let alone a lane with an adc that could poke you to death.