code: public List<ChampionStatInfo> retrieveTopPlayedChampions(long accId, GameMode mode) {
          return client.sendRpcAndWait(SERVICE, "retrieveTopPlayedChampions", accId, mode);
      }
docs: Retrieve the most played champions for the target player
  @param accId The player's id
  @param mode The mode to check
  @return Champion stats