How do you get the Space Day Nautilus Icon?
It was a mission or event reward. Riot's description in the client reads: “Earned by participating in the 2018 Cosmonautics Day event (region exclusive), or purchased in other regions.”
Is the Space Day Nautilus Icon still available?
No. Riot tied the Space Day Nautilus Icon to 2018 (mission reward), and it does not normally bring back past event rewards or bundles.
