Blow up your world!!!
Note: Minify the command to avoid issues :)
More Mobs: Air Zombies 1.8.7 (Read The comments
MOTHER OF ALL THE MOBS!!!!!
Zombie Horseman (1.9.1)
WTF?!?!?!?!
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)