Have you ever been to a mushroom island biome? if you have then you would most likely want to live there. But you have an awesome house with all of your stuff there and you cant go back because then you will not find the way back. so if you want to live in a mushroom biome then just make an enchantment table and hopefully you will get a silk touch enchantment (with book shelfs of course) and then just mine up some mycielum grass and some shrooms and find your way home. there you have ur little pice of the rarest biome.