3 words: Flying Ender Crystal.
Note: Minify the command to avoid issues :)
Glass Helmet (used underwater!)
Stormtrooper v2!
Iron Golem Drummer
Improved Star Wars in only one command!
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)