Iran Raises Black MAHDI Flag First Time In History - Islamic Messiah About to be Revealed?

Last week Iran raised a black MAHDI flag for the first time in its history. This is the flag of their Islamic Messiah, the Mahdi, the 12th Imam. It's the flag that their scriptures say will be carried to Jerusalem in victory. Is it a sign that the Mahdi is about to be revealed? What will be the impact on the rest of the world? What does our Bible say about what happens after this man is revealed?