MY BEST FRIEND!
Note: Minify the command to avoid issues :)
Creeper Firework
Realy! do not do that!
More mobs:Nature skeletons 1.8.7 (Read the comments!)
Blaze Master Boss Battle
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)