How do you get the FPX Vayne Signature Icon?
It was a mission or event reward. Riot's description in the client reads: “Honoring Lwx's winning Vayne in the 2019 World Championship.”
Is the FPX Vayne Signature Icon still available?
No. Riot tied the FPX Vayne Signature Icon to 2020 (mission reward), and it does not normally bring back past event rewards or bundles.
