Dr Trayaurus from DanTDM!
Note: Minify the command to avoid issues :)
Summon Dr Trayaurus!!!!!!!!!
Splash Potion of a Zombie
Mining Shop
A Wither Boss Spawner!
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)