Viktor Runes explained
There's one set of runes for Viktor on patch 14.22 that is the clear favorite for LoL players and pros alike. The best Viktor rune paths on the position 
Mid are 
Sorcery as the primary path and 
Precision as the secondary path with a pick rate of 32%. Besides picking runes on Viktor you should learn how to play Viktor and if you are interested in pro matches take a look on how a pro builds Viktor. If you want to discuss 
Viktor then you should visit the champion subreddit.
Viktor runes from primary path
Sorcery empoweres abilities of Viktor and increases the available champion resources. Most of high elo players – and our LoL pros in the the major regions – have agreed that 
Summon Aery is the best keystone rune to run on Viktor. This keystone rune adds more poke damage to your abilities. And additionally grants an extra shield, whenever Viktor empowers or protects an ally with abilities. Other primary runes on Viktor are 
Manaflow Band, 
Transcendence and 
Scorch.
This is usually followed up by taking Manaflow Band for additional mana and mana regenaration. Transcendence for some more Ability Haste. Scorch increases your control in the early game.
Viktor runes from secondary path
When it comes to your secondary path, most Viktor players prefer to go with Precision. Precision improves attack and sustained damage on Viktor troughout the match. On the Precision path, the best runes for Viktor are 
Cut Down and 
Presence of Mind.
If the enemy team consists of multiple tanks, then the rune Cut Down is the best choice. Presence of Mind helps Viktor with the mana problems by restoring missing mana, if a champion is killed.
FAQ for Viktor Runes
Which is the best keystone rune on Viktor?
The best keystone rune on Viktor is Summon Aery. This Viktor runes setup is then referred as Viktor Summon Aery.
What runes does Viktor use?
Runes from the paths Sorcery and Precision are the most used runes on Viktor. For the exact pick rates of Viktor runes used, you have to study the rune distribution presented.