I used MrGarretto's command combiner, so this is not entirely mine.
Note: Minify the command to avoid issues :)
I present to you, Potion of Levitation!!
MOST OP BOOTS
Simple Villager Shop
Tony Stark
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)