As you know the mountains are very cold. Snow and ice will spawn in the mountain biome. What if crops and trees will not grow as well or become frozen when grow in this frigid biome. This leads me to the idea of Nether’s curse. In a new biome which could be added in 1.16 called mountain valley. This valley would be large and covered in ice and snow and large majestic mountains guarded its four entrances. In the middle of the valley would be a yeti tomb. Somewhere in the tomb would be a nether portal bring you to a piglin. The portal would be guarded by a yeti that could freeze you inside ice and suffocate you.The piglin inside the portal after the Yeti is defeated would allow you to barter with it and get the Nether Curse. When this block is placed in a frozen mountain/snowy biome, it would melt all the snow in a dome at least spanned 50 blocks away. This would also allow you to grow crops and farm in the frozen biome without your crops freezing. This idea would allow a lot of relations to the nether and the over-world and with 1.16.