How do you get the Season 2019 - Split 3 Icon?
It was a ranked reward. Riot's description in the client reads: “Earned by winning ranked games in Season 2019 - Split 3.”
Is the Season 2019 - Split 3 Icon still available?
No. The Season 2019 - Split 3 Icon was a ranked reward. To earn it, you had to peak the required rank during Season 9 (2019). Riot does not hand out past ranked rewards again, so you cannot earn this icon anymore.
