League of Legends Mastery: Summoner's Insight
Summoner's Insight
Mastery Tree: Cunning

Improves the following Summoner Spells:
Teleport: Reduces cast time by 1 second.
Promote: Increases promoted minion's bonus defensive stats by 15%.
Flash: Reduces cooldown by 15 seconds.
Clarity: Increases Mana restored by 20%.
Clairvoyance: Increases duration by 2 seconds.
Makes
Nope, just excuses mana misusage
Its allow more good map vision (
And for mages, this is 1 Point in Utility tree with