Contested War Zone — ruling 1

The last activated ability affects all attacking creatures, not just those you control.

Contested War Zone — ruling 2

The word “you” in a permanent’s trigger condition always refers to the permanent’s current controller.

Contested War Zone — ruling 3

Gaining control of Contested War Zone doesn’t cause it to tap or untap.

Contested War Zone — ruling 4

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.

Contested War Zone : règles, fonctionnement et interactions (MTG)

Contested War Zone is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Whenever a creature deals combat damage to you, that creature's controller gains control of this land. : Add . , : Attacking creatures get +1/+0 until end of turn.

How it works : Contested War Zone

Original English text — Wizards of the Coast / Scryfall

#1June 1, 2011· Wizards of the Coast
The last activated ability affects all attacking creatures, not just those you control.
No other card is named in this ruling.
#2June 1, 2011· Wizards of the Coast
The word “you” in a permanent’s trigger condition always refers to the permanent’s current controller.
No other card is named in this ruling.
#3June 1, 2011· Wizards of the Coast
Gaining control of Contested War Zone doesn’t cause it to tap or untap.
No other card is named in this ruling.
#4June 1, 2011· Wizards of the Coast
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.
No other card is named in this ruling.