Lets talk about Skarner

I still think Skarner needs some work. The latest buffs did deffinitly help him alot in the Jungle, but he simply doesn't deliver the good old Scarner feeling, while the new feeling isn't very attracktive(~0.9% pickrate atm...)

And he still is worse than befor in a sololane.
The old Skarner was much better in most matchups, much more sustain, full dps on demand, STICKING POWER, actually higher dps(slightly more as, less cd on E), and u could lvl up W for insane trading power as it increased ur dps and shield at the same time. Also, he simply scaled better into lategame as his permaslow allowed him to be a hige annoyance as tank, while his ap ratios also allowed him to be a strong Bruiser with the right gear.

Now, his permaslow is gone, so he can't abuse his theoretical dps as good, and he's less disruptive as a tank, while he also won't do as much on ap as befor cause his defensiv scalings and offensiv scalings got nerfed.

For offens, his E simply got 4 sec more cd with the same ratio and base dmg, so his dps got hit quite a bit on ap

For defense, the lost heal was much more powerfull than the new shield buff:

Old effecktive hp/sec from shield+heal(no cdr or passive procs):
15.625(+0.0375) + 9-18(+0.03-0.06)= 24.625 - 33.625(+0.0675 - 0.0975) (healvalues depended on the number of targets)
New effecktive hp/sec from shield: 21.429(+0.0571)
so even vs 1 target, the old shield+heal had better base values and better scaling than the buffed shield

I think the new Skarner needs his heal back, even if the shield values needs to get nerfed then, and consuming the healmark should refresh the E slow(the slow values needs to get lowered then), so u get some of the old stickingpower back, but no permaslow and bound to an skillshot.
He also needs the dmg on his E buffed to 80/130/180/230/280(+0.8ap) to compensate the higher cd.(16.66% more base dmg and 33.3%more scaling still would mean less dps as the cd was increased by 40%)

Even though it's not a huge issue balance wise, the new Q also could need some change.
The empowered mechanic feels pretty od now, as it serves no purpose anymore.
Old scarner needed the 'charge' mechanic to delay his permaslow, as he would have been pretty broken otherwise, but now there is no reason why his Q shouldn't deal full dmg from the first strike.
There is also no conection between the empowered Q mechanic and the stacking as-buff, u do one Q, ur claws start an awsome glowing, but u need 2 more Qs to reach the full as buff.
And the empoered Q just isn't as special as it looks anymore, the dmg difference isn't realy noticable unless u go ap, and thats all, while the visuall effeckt changes from meh to epic.

Old Skarner Q was like this:

Enemy 1: look, a wild Skarner, how sweet...
Enemy 2: wait, his claws start glowing...
Enemy 1: damn, ur Right! We got to Run!
Enemy 2: NOO, It'S to late, he got us!
Enemies: AHHRGHH

New Skarner Q is more like that:

Enemy: Hey, wha's up with ur claws?
Skarner: Hmm? whats with them?
Enemy: They are glowing...
Skarner: Oh yea, that. It just happens sometimes..
Enemy: What does it mean?
Skarner: Dunno, it just looks fancy and stuff i guess.
Enemy: Well...ok, gotta go, see u.

TL;DR, Scarner needs more work. He still doesn't deliver his old feeling, and while the resent buffs did help him alot as a Jungler, he still is worse than the old one as a sololaner.