Database: card_games
Question: Among the cards in the set "Hauptset Zehnte Edition", how many of them are designed by Adam Rex?
SQL: SELECT COUNT(T1.id) FROM cards AS T1 INNER JOIN set_translations AS T2 ON T2.setCode = T1.setCode WHERE T2.translation = 'Hauptset Zehnte Edition' AND T1.artist = 'Adam Rex'