On u.gg, from Iron-Silver rank they consider AREY to be the BEST Azir rune. So many people in those ranks have played Arey azir that the winrate overtook the more viable options.
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GamePOW - Azir Rune Build! <3 THE WHYS: - LETHAL TEMPO Azir loves to auto attack with his soldiers, especially with his most recent changes. With Lethal Tempo you're able to scale