This plugin makes an egg spawn at y 200 when you spawn in. This egg will chase down the nearest entity, including you, until it reaches it. Once it does, it will kill it and turn it into another egg. Eventually, there will be an ocean of eggs for you to run from! Also, when an egg kills a player, it spawns a glowing egg. Glowing eggs will go around 50% faster than normal eggs. There is no limit to the amount of eggs that spawn, so if the server starts to lag, maybe run this command: /kill @e[type=egg]
Do note that eggs destroy water and lava, so maybe don't lead them there.
This plugin may or may not be balanced and/or updated. Good luck with this incredible challenge!