Hearthstone Legend: Why don't I have a ranking model?

The steps are as follows:

Open hearthstone legend. Click "Combat Mode". Click the icon in the upper right corner to switch to "standard combat" mode. Click to select the card group you want to use. Click to select "Ranking Mode". Just click the "Start" icon.

Hearthstone is a card game released by Blizzard Entertainment, which was released worldwide on March 14. As one of the main games of Blizzard, it is also an extension of the classic Warcraft series. In the game, players can choose one of the top ten classic heroes of Warcraft series to form their own unique deck around their hero's career and play against other players.