This Is Pretty Cool.
Has Awesome Drops, Too!
Note: Minify the command to avoid issues :)
The Batty Witch
Automatic Aggressive (And Passive) Mob Killer! Another One Command Creation!
THE KING FISHER!
Lovesick Heart!
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)