During the reign of Emperor Taizong, he speculated that Tang Xing III and Li Xing of the Five Dynasties were prophecies. Emperor Taizong was convinced of this, so he killed all those surnamed Wu above the imperial court.
Later, Yuan Tiangang speculated that this person was a harem middleman. At that time, only Wu Zetian was surnamed Wu in the harem, so Emperor Taizong suspected Wu Zetian, but did not act.
On this one thing, you can already see Yuan Tiangang's fierceness. Later, he wrote the book TuiBei, which is a legend. I heard that it contains a lot of Yuan Tiangang's speculation about later generations. This book is proof of Yuan Tiangang's ability.
Such a talented person will definitely be called magic by future generations, and he is a magic in himself. For Li Lai, a famous geomantic master in Tang Dynasty, the situation is even worse.