This command summons a giant end/nether flying stack of mobs:
Note: Minify the command to avoid issues :)
WACKY, RIDICOULOS STARTER CHEST
YOU WERE LUCKY TO FIND THIS VILLAGER COMMAND :)
MEDICINE DEALER
I DON'T KNOW WHAT EXACTLY :|
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)