Minecraft wiki entry for Command_blocks_and_functions, associated text: Using the SpawnPotentials tag, you can create a mob spawner with multiple mobs in it. It will randomly pick one each time when the timer is reset (a second after spawning the previous mobs). Since these codes contain multiple mobs, they tend to be quite long codes. Here's a version of the SpawnPotentials code, that is easier on the eye:br>