God's written Word is the most reliable foundation for guidance, and prophecy is less reliable, and dreams are the least reliable.
Not true!
Not even the bible itself makes that claim about itself!
Nor do the countless stories related within your bibles confirm such a conclusion.
I agree the scriptures are the most reliable foundation for life, but for close personal direction that is solely the job of the Holy Spirit.
And limiting God to speaking via scriptures alone is putting a man made gag on Him.
I would test every "prophetic" dream with the Word of God, and if it seems consistent, the I would wait and see what happens.
There is no scriptural basis for such a commonly made claim, and given the nature of most prophetic dreams, it would be a fruitless task anyway.
How would Paul have checked his dream of the man from Macedonia in the scriptures?
How would Pilate's wife have found confirmation of her dream in a bible, if she had one?
How would Joseph have known from the bible what to do when he found that Mary was pregnant?
How would Nebuchadnezzar have confirmed his dreams about the great image with the head of gold in the bible.
How would Pharaoh have confirmed his dreams about the 7 years famine from a bible.
How would the wise men have confirmed their dreams about not returning to Herod by searching the scriptures?
In contrast to checking the bible to confirm the veracity of dreams, the reverse happened and these dreams were subsequently added as a part the bible!
I would not make any serious decisions based on a dream, no matter how "prophetic" it may seem.
Unbiblical fearmongering.
I have made many serious decisions based on dreams (or visions etc.), and they have always been very fruitful.
And the vast majority impossible to confirm from scripture.
Here are 2 examples from an endless list of experiences.-
1). Back in the 80s, the brand new double heating system in a big building project had failed. Since installation and commissioning, it had kept shutting down after 20 minutes or so of running, and I was now in big trouble as the building hand over deadline was a few days away.
We tried all sorts of things and had various specialists opinions, but nobody had an idea of the cause.
I was now facing a financial penalty if I didn't resolve it by the due date in a few days time.
Then one night, I had a dream where the Lord in technicolor detail showed the cause of the problem. As soon as I arrived at the site, the fault was confirmed and easily rectified, much to the amazement of those concerned.
To claim I could get that information from a bible is laughable.
2). In 2014, my wife and I sold up and moved hundreds of miles to a new part of the UK.
Again that was on the basis of revelatory dreams, visions etc. No scriptures were consulted.
After contemplating the dreams and words and finally making the decision to immediately put our house on the market, I walked out the front door to do something.
Whilst still on my doorstep a complete stranger passing by greeted me and we started to chat, and in the middle of that I mentioned we would be moving soon.
He asked how much we were selling for and immediately offered the full price.
Within 5 minutes of the decision I had sold the house to a complete stranger for the full price and he didn't even want to look inside!
We moved to the new area and rented for a short while, whilst looking at properties. Then, as before, the Lord via a dream showed us which house and also showed us how to buy it, as it was outside our price range.
Again, it is laughable to claim any of this could be found in the bible.