Contested War Zone

• WWizards of the Coast2011-06-01
  Official Ruling
  Gaining control of Contested War Zone doesn’t cause it to tap or untap.
• WWizards of the Coast2011-06-01
  Official Ruling
  The word “you” in a permanent’s trigger condition always refers to the permanent’s current controller.
• WWizards of the Coast2011-06-01
  Official Ruling
  In some multiplayer formats, creatures controlled by different players may deal combat damage to you simultaneously. If this happens, you control each triggered ability and can put them on the stack in any order. The last ability to resolve will determine who ends up controlling Contested War Zone.
• WWizards of the Coast2011-06-01
  Official Ruling
  The last activated ability affects all attacking creatures, not just those you control.

Rulings via Scryfall