Hi! This command add the jerk mob like you saw in the title. Try to challenge yourself by spamming the Jerk with a lever, but be careful! Those guy aren't laughing around! Sorry I didn't find how to put my screenshot. =(
Makes portals in Minecraft. Not done yet planning on add custom model and sound effects. To make it work place a command block and put an activator rail on top of it then paste the command in after that run the command block.