What would induce God to change His mind? Perhaps new information, some knowledge He lacks until we communicate it to Him for His consideration. However, the Bible tells us that when we come to our King in prayer, He already knows what we are going to ask for and He knows what we need better than we do. We have to remember that this One we're talking to is omniscient. He doesn't learn anything new. So if you're going to change His mind by your prayers, it won't be because you give Him new information.