Oasis being a rare biome

Deserts need to be made more attractive and oases would be a good place to start.

•These would be new biomes which would have a perfect location in the middle of the deserts with a low probability of appearing and which would be rich in iron and gold minerals underneath.

•They would have some lakes that would vary in size and quantity, these would be surrounded by palm trees, new trees with new wood that would provide coconuts, which can fall inflicting damage less than that of the anvil and greater than that of suffocation.

•Other things I could add would be some aquatic mob exclusive to this place, something similar to the mooshrooms that are only found in mushroom fields, and making this biome contain treasure chests, making these oases can also be found thanks to maps of the treasure.