How do you get the Worlds 2015 KOO Tigers Champion Icon?
It was a mission or event reward. Riot's description in the client reads: “This icon was granted to players who owned the 2015 KOO Tigers icon if KOO won on 10/31.”
Is the Worlds 2015 KOO Tigers Champion Icon still available?
No. Riot tied the Worlds 2015 KOO Tigers Champion Icon to 2015 (mission reward), and it does not normally bring back past event rewards or bundles.
