For completing each of the twenty Championship leagues, you receive a reward.

League 1 - Blot.  

  League 2 - "King of the Hill” game mode. 

  League 3 - Sparkle. 

  League 4 - “Squad VS Squad” game mode. 

  League 5 - “Sabotage” game mode, Levi. 

  League 6 - Cyclops. 

  League 7 - “Arcade” game mode. 

  League 8 - more resources in the chests. 

  League 9 - Ghost. 

  League 10 - more resources in the chests. 

  League 11 - more resources in the chests. 

  League 12 - Hurricane. 

  League 13 - more resources in the chests. 

  League 14 - more resources in the chests. 

  League 15 - Satoshi. 

  League 16 - more resources in the chests. 

  League 17 - more resources in the chests. 

  League 18 - more resources in the chests. 

  League 19 - more resources in the chests. 

  League 20 - more resources in the chests. 

Please note: a reward for a league is issued not for joining it but at the moment of its completion and transition to the next one. For example, to get Satoshi, you need not just go to league 15, but complete it.