When you hit a command cube, a random command runs. Command cubes are also invincible and always glow so they don't get lost. Be careful, they're very dangerous!
Command cubes can use:
/advancement
/damage
/difficulty
/effect
/experience
/gamerule
/give
/loot
/place
/playsound
/setworldspawn
/spawnpoint
/summon
/time
/weather
