This command summons a giant end/nether flying stack of mobs:
Note: Minify the command to avoid issues :)
UNSPEAKABLE TROLL COMMAND
CONCEALING HORSE
≈EPIC SPEED STICK≈
EXPLODING DEATH MACHINE
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)