Miracle

Allah (SWT) Revives the life of whomever He Wants, so it is allowed to be mentiined because it is definitely possible for Allah (SWT).

Wassalam.

Prophet Muhammad (SAWA) performed miracles when ever Allah (SWT) wanted him to perform miracles to proof his prophet hood. His greatest Miracles which are still and will remain accessible to all human beings is Quran then Ahlul Bayt (AS).

'Wassalam. 

All the Prophets faced injustice and many of them were killed like Prophet Yahya, but never used divine power or miracles. Allah Wants life to go according to the same system that He created. Allah (SWT) does not use His divine Power against those who disobey Him because He leaves people to do whatever they decide and postpone the final result to the Day of Judgement.

Using divine power will then force people to believe which is against the principle of testing people to make them choose between right and wrong.

Wassalam.

Quran is the greatest miracle in the whole history of the world, which proves that it can never be made by any one but Allah with His unlimited powers and unlimited Knowledge.

Miracle is something that people can not do it e.g. Prophet Jesus was granted by Allah the ability to revive the dead and cure the cureless. His miracles were limited to his time and no one can witness any of Jesus miracles now. The miracles of Quran is everlasting and can be witnessed by any one, any where and any time. Quran has challenged its enemies who used to claim that it was made by Muhammad, to bring like Quran even if the gather all their allies and supporters from Jinns and humans. The enemies of Quran failed to stand to the challenge. Allah then challenged them to bring ten chapters like the chapters of Quran which are 114 chapters. They failed again. Then Allah challenged them to bring just one chapter like any of the 114 chapters of Quran. They failed again. This challenge has proven that Quran is never from any human source otherwise the enemies of Quran could have brought anything like it even one chapter like any of its 114 chapters. Millions of Arabs today are non Muslims and they know the Arabic language very well, yet none of them could make even one line like Quran. This is an evidence which is enough for any one who thinks in proper way.

Quran was revealed on the Prophet Muhammad (SAWA) from Allah (SWT) and the allegation of obtaining it from Christians and Jewish communities has no scientific value at all, when you read Quran and compare it with the Jewish and Christian texts. Some similarities are there because the common origin of all the three texts is from Allah, but Torah and Bible were distorted while Quran remained remained constant and unchanged.

Wassalam.

The miracle of splitting moon was witnessed by all the enemies of the Prophet Muhammad (SAWA) and was mentioned clearly in Quran in front of all the enemies including the idol worship pets of Quraish, Jewish and Christians people, and none of them challenged it. This itself proves that it was an undeniable fact.

An ancient India document quoted by Muhammad Hameedullah in his book ( Muhammad, The Messenger of Allah) mentioned that a king in Malabar  southern India by the name of Chakarwati Farmas  has witnessed the splitting of the moon and informed others and traveled  to Makkah to meet the Prophet. He accepted Islam and returned back india but died in the way back and buried in a place called Dhafaar which is now in Sultane of Oman. This document is still existing in the British Museum according to this book under number 2872/152-173. 
In short, if this miracle mentioned in Quran did not happen, you would have seen many enemies of Quran denying it, but no one at all denied it.

Wassalam.

No one can claim ability to show miracles but by the Prophets and Infallible Imams.

Wassalam.