Viktor is sitting at a low winrate and haven't been viable for a long time...
As the title says...
is sitting at around a 45%-47%:
http://champion.gg/champion/Viktor/Middle?league=silver%2Csilver%2Cbronze
http://www.lolking.net/champions/viktor#/overview
http://www.op.gg/champion/viktor/statistics/mid
Q: Siphon Power
Damage increased from 60/80/100/120/140 to 70/90/110/130/150 plus 7/9/11/13/15% of the target's current health
Discharge damage increased from 20/40/60/80/100 to 30/50/70/90/110
W: Gravity Field
Stun duration increased from 1.5 seconds to 1.6/1.8/2/2.25/2.5 seconds
Stacks needed lowered from 3 to 2
Slow increased from 28/32/36/40/44% to 50% all ranks
E: Death Ray
Damage increased from 70/110/150/190/230 to 80/120/160/200/240
Aftershock damage increased from 20/60/100/140/180 to 30/70/110/150/190 plus 10/12/14/16/18% of the target's maximum health
R: Chaos Storm
First cast damage increased from 100/175/250 to 150/250/350
Second cast damage increased from 100/150/200 with 10% bonus true damage