Note: Minify the command to avoid issues :)
Ice army: The return PART I
Herobrine in one command ! (Don't spawn him!)
A nice firework
More mobs: Burning skeletons 1.8.7 (Read The comments)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)