With viktor is very easy to dominate the lane. only 2 counters are possible to survive vs viktor (Ahri, Leblanc). every time if your enemy is in near give him a power transfer. the schield safe u for counter harassment, so i max it at first. at only at ganks use your gravity field. if the enemy runs away after your power transfer u can easy give him a death ray.
If u play vs champs like kassadin or malzahar, use your power transfer before the silence of kassa or dot of malzahar. the hourglass for counter the focus....u will be focused ;)

I victory every time in mid without a good Leblanc as counter.