How do you get the 2017 Worlds Master Icon?
It was an event pass reward. Riot's description in the client reads: “Acquired by purchasing 2017 Worlds Master Pass during 2017 Worlds.”
Is the 2017 Worlds Master Icon still available?
No. Riot tied the 2017 Worlds Master Icon to 2017 (event pass), and it does not normally bring back past event rewards or bundles.
