Rich leaders that are hostile towards Muslims taking the lead is a portent of the appearance of Hazrat Mahdi (pbuh)

103- Ghaibat Nomani: It is narrated from Ibne Uqdah from Ahmad bin Yusuf from Ismail bin Mahran from Ibne Bataini from Wuhaib from Abu Basir from Imam Muhammad Baqir (a.s.) that he said: When the Umayyads (rich leaders that are hostile towards Muslims) rule … Their state remains strong and they live at ease and wealth until they disagree among themselves. THEN THEIR STATE WILL DECLINE AND THE PEOPLE OF THE EAST AND OF THE WEST WILL DISAGREE. PEOPLE WILL FACE DIFFICULT TIMES FULL OF TERROR. THEY WILL REMAIN SO UNTIL A CALLER CALLS OUT FROM THE HEAVENS. WHEN YOU HEAR THE CALL, YOU ARE TO HURRY UP (TO JOIN THE QAIM)

(The Promised Mahdi, Allamah Muhammad Baqir Al-Majlisi, English Translation of Biharul Anwar, Volume 13 (Old Edition)/ Volum 51-52-53 (New Edition), Kitabul Gaibah-Book of Occultation, Imam Mahdi(a.t.f.s)- The Twelfth Imam of the Twelver Shia, Part II, Translator; Sayyid Athar Husain S.H. Rivzi)