Easy it's just a Ghast Riding a GIANT
Note: Minify the command to avoid issues :)
Annoying Villager Murderer
Cool Holographic Text (No more floating horses)
The Creepiest Giant EVER
Diginer's Axe
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)