This actually needs two command blocks.
Achtung: Minifiziere den Command um Probleme zu vermeiden :)
NEW AND IMPROVED LITTLE PUFF!!! (Little Puff 2.0)
sp00ky sign
ME WANT DIAMONDS
walcom hom jimmy
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)