How do you get the 2015 World Championship?
It was sold in the League of Legends store. Riot's description in the client reads: “This icon was released in the store during the 2015 World Championship.”
Is the 2015 World Championship still available?
Probably not. Riot tied the 2015 World Championship to 2015 (store purchase), and it does not normally bring back past event rewards or bundles.
