This is just a Zombie riding a Cow. Have Fun!
Note: Minify the command to avoid issues :)
Cursed Training Dummy
Spell Tome of Heath II
Villager Calvary Soldier
Troll Blocks 1 Command Creation!
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)