How do you get the TCL - Summer 2021?
Riot released it to celebrate an event or milestone. Riot's description in the client reads: “This icon is to celebrate the TCL fans across the globe.”
Is the TCL - Summer 2021 still available?
No. Riot tied the TCL - Summer 2021 to 2021 (celebration icon), and it does not normally bring back past event rewards or bundles.
