Flystin

 Flystins - A unique mob and block.

* A flystin is a mob and block. These mobs live in the sky near cloud level y and is passive-aggresive. They never land and continuously move on with there day. They eat clouds and if phantoms are in the way, they will attack them. If raining, they will become stationery unless tamed. They despise water.
* Health: 10 hearts
* Attack: 1 heart
* Speed: Baby zombie
* Appearance: A piston that has chicken wings that flap. They only look like a piston to adapt in to the territory and not be recognized by their predator phantoms. They have feather like front instead of wood. The sides appear like scales. The chicken wings are black. They really aren't a piston, well almost. In block mode, the wings are removed for trickery reasons.
* These flystins can be tamed. They are tameable with any food item. Once they are tamed, they become a piston. A literal block that you can mine, harvest, move, and keep using like a normal piston. To stop them from moving, you shift-right click on it with a feather. This will turn them back into the mob and will move in the direction the Piston is headed. Repeat action to stop flystin with a feather rendering back into block mode. Think of this as if you are tickling the mob to get it to move. This only works on flystins. If you tried this on a regular piston, nothing will happen.
* Flystins will be able to hold blocks when tamed. When you tickle the flystin with a feather and block is in front, it will hold it while moving in the direction it was pointed. Once tickled again, a flystin will pop the block held off in front and stay put.
* When a flystin is not moving, you can make it work just like a regular piston.
* In the end, a rare type of flystin exists that is a sticky variant. Basically a sticky piston version. It has 12 hearts and 4 attack points
* When killed in mob state, it will have a chance at dropping feathers, pistons, and 0.4% chance of sticky pistons. These will not drop itself and will no longer be a flystin unlike when tamed.
* Breeding: They are the first asexual mob and just breeds itself over time. About 4 night/day cycles will produce a baby flystin.
* As this is a mob, it doesn't need a crafting recipe
* Movement: They Bob up and down in a straight line wherever the head is pointing. They go up 1, over 1, down 1, over 1, up 1, and repeats.
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This could help with redstone but it is also meant to be a mob for a hilarious outcome to lighten the mood of the game and encourage players to build higher up in the sky and explore the end.  It could be a new unique way to travel.