As a boy, Mohammed bin Salman played video games alone in his family palace because Saudi Arabia’s religious police permitted no public entertainment. The imaginative boy came to believe that anything possible in a video game is possible in real life. Now, as Crown Prince of Saudi Arabia, his dream is equally audacious: He seeks to maneuver among Iran, Israel, and the United States to bring peace and prosperity to the Middle East. His nation has emerged unscathed from the 12-day war between