Note: Minify the command to avoid issues :)
WTF?!?!?!?!
More Mobs: Air Zombies 1.8.7 (Read The comments
Evil Golems in 1 command
Creeper Firework
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)