Laser Beams!
Note: Minify the command to avoid issues :)
Angry Pigzombie (1.9.1)
More pickaxes in one command
More mobs in 2 command (Second one below}
Minotaur
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)