This is just a Zombie riding a Cow. Have Fun!
Note: Minify the command to avoid issues :)
Zombie Calvary Soldier
Spell Tome of Heath II
Wizard: Used in Wizard Battle
Vanilla Turf Wars Gun Salesman
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)