Note: Minify the command to avoid issues :)
Super Jump Potion Fly In Survival
Galaxy-Eyes, Photon Dragon (Boss Fight)
Actual Battle Arena in seconds (literaly a battle arena)
How to use /summon {MOB} riding {MOB}
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)