How do you get the Season 2019 - Flex Grandmaster Icon?
It was a ranked reward. Riot's description in the client reads: “This icon was earned by finishing Grandmaster in Flex Queue in Season 2019.”
Is the Season 2019 - Flex Grandmaster Icon still available?
No. The Season 2019 - Flex Grandmaster Icon was a ranked reward. To earn it, you had to reach Grandmaster in Flex during Season 9 (2019). Riot does not hand out past ranked rewards again, so you cannot earn this icon anymore.
Season 2019 - Flex Grandmaster Icon is one of the rarest LoL summoner icons.
