Granted. You can have that plane, but no Planeswalkers or planar portals can ever reach it (or reach any other planes from it), it's isolated far enough away from any other planes that even with infinite time and flowstone you'll never be able to pull off anything like Yawgmoth did with Rath, and I will personally clean up any residual oil I find on other planes (or, more likely, get Colin to do it).
I wish that Urza had figured out that the drop of oil in Xantcha's heartstone would cause problems later and corrected for it before he finally switched Karn on.