Feroz's Ban

From MTG Salvation Wiki

Feroz's Ban was a magical shield around the world of Ulgrotha erected by Feroz to keep other planeswalkers from harming the plane and its inhabitants.

The Ban was erected for the sole purpose of preventing other planeswalkers from using the denizens of Ulgrotha for their duels. The plan was a complete success, preventing planeswalkers from even entering Ulgrotha for many years. This shield was created using an artifact owned by Serra, Feroz's ally and eventual wife. Because of the Ban, the Great Wood flourished and the Force of Nature called Autumn Willow was made manifest. After Feroz's death in a lab accident, the Ban was devastated and Ulgrotha again fell prey to the whims of planeswalkers.