slow lets him hit easier q, and no other rune is as useful against ww while inspiration has amazing secondary runes (free boots allows him to spend that extra 1k gold on actual items that are more impactful, 3 potions are super good, jack of all trades gives super useful stats in and out of lane)
Why glacial rays??
slow lets him hit easier q, and no other rune is as useful against ww while inspiration has amazing secondary runes (free boots allows him to spend that extra 1k gold on actual items that are more impactful, 3 potions are super good, jack of all trades gives super useful stats in and out of lane)