How do you get the Season 2023 - Split 1 - Flex Challenger Icon?
It was a ranked reward. Riot's description in the client reads: “This icon was earned by finishing Challenger in Flex Queue in Season 2023.”
Is the Season 2023 - Split 1 - Flex Challenger Icon still available?
No. The Season 2023 - Split 1 - Flex Challenger Icon was a ranked reward: to get it you had to reach Challenger in Flex during Season 13 (2023). Riot does not give out past ranked rewards again, so it cannot be earned anymore.
Season 2023 - Split 1 - Flex Challenger Icon is one of the rarest LoL summoner icons.
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