Morgana Runes explained
There's one set of runes for Morgana on patch 14.23 that is the clear favorite for LoL players and pros alike. The best Morgana rune paths on the position 
Support are 
Sorcery as the primary path and Inspiration as the secondary path with a pick rate of 48%. Besides picking runes on Morgana you should learn how to play Morgana and if you are interested in pro matches take a look on how a pro builds Morgana. If you want to discuss 
Morgana then you should visit the champion subreddit.
Morgana runes from primary path
Sorcery empoweres abilities of Morgana and increases the available champion resources. Most of high elo players – and our LoL pros in the the major regions – have agreed that Arcane Comet is the best keystone rune to run on Morgana. This keystone rune adds more damage to your abilities and increases your power in the laning phase. Other primary runes on Morgana 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.
Morgana runes from secondary path
When it comes to your secondary path, most Morgana players prefer to go with Inspiration. Inspiration opens creative opportunities on Morgana troughout the match. On the Inspiration path, the best runes for Morgana are Biscuit Delivery and Cosmic Insight.
Biscuit Delivery is a great rune for laning as it gives additional health and mana, which can help in more aggressive lanes. Cosmic Insight grants summoner spell and item haste.
FAQ for Morgana Runes
Which is the best keystone rune on Morgana?
The best keystone rune on Morgana is Arcane Comet. This Morgana runes setup is then referred as Morgana Arcane Comet.
What runes does Morgana use?
Runes from the paths Sorcery and Inspiration are the most used runes on Morgana. For the exact pick rates of Morgana runes used, you have to study the rune distribution presented.