So I was thinking we could have a world which is a Hardcore World with PvP enabled all the time and it is permanently night with no passive mobs. Wolfs will be either removed , untamable or are hostile till tamed. When you die on this world you will be banned for 24 hours and sent back to spawn on main world. You can still login and be in all worlds but Hardcore when you type the command(Hopefully /warp hardcore) it will say You are banned for X hours.
Please tell me if you like this idea or not