Like most of the other Chobanids, Yagi Basti threw his support behind his nephew Hasan Kuchak when the latter took control of northwestern Iran in 1338.
There he met the Injuid Mas'ud Shah and formed a plan to seize the city of Shiraz from Pir Hosayn, who was Yagi Basti's cousin.
The two led an army to take Shiraz, only to learn that Pir Hosayn had lost the city to another Injuid, Abu Ishaq.
Malek Asraf, Yagi Basti and his half-brother Surgan gained control of the Chobanid realm after Hasan Kuchak's death.
Around 1344, Yagi Basti was secretly murdered in Tabriz by Malek Asraf, who went on to defeat Surgan and take sole possession of the Chobanid realm.