My 3 cents on Skarner
1st cent: his passive doesnt stun long enough for the work it takes to apply. Id say 1.5 or at least 1.25 seconds up from 1 second would be fair.
2nd cent: consuming crystal venom stacks on target to deal a modified attack should not prevent further application of stacks, but instead prevent consuming them again with crystallizing sting for 6 seconds instead so that skarner can still make use of his ults bonus damage per stack for follow up.
3rd cent: his fracture is still too weak for the long cd it is. I feel like 220+60% ap would be perfect but at least 200+50% ap is needed, up from 180+40% ap