My idea is to have a "Designated Griefer" and its role is to be a nuisance. The reason behind this is that sometimes just building, staying in a building and building around lava can become stale to some players. While having a random player able to swim through lava and possibly be invisible. Being able to delete any block (besides water and lava spawners) within a time limit e.g once every 10 seconds. So that will make it so that there's a challenge other than building. And maybe make it a "voteable" game type. What do you think?