Rule 190.3
Control can be Contested through the course of play.
- 190.3.a Contested is a temporary status applied to the battlefield when a Unit controlled by a Player who does not currently…
- 190.3.b Once a Showdown or Combat begins at a Battlefield, it remains Contested until Control is established or re-established.
- 190.3.c The state of a Battlefield being Contested is used to determine when Combat should occur and when a Non-Combat…
- 190.3.d At this time Game Effects cannot reference this status.