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Note: Minify the command to avoid issues :)
More mobs in 1 command (Read The comments!)
Magic heads in one command
YOU WANT TO THROW THE DIAMOND PICKAXE IN LAVA FOR A WOODEN ONE ?
A nice firework
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)