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At the beginning of your upkeep, sacrifice Peacekeeper unless you pay {1}{W}.
Creatures can't attack.
If the creature is no longer on the battlefield when the ability resolves, you may still perform the action if you want.
Peacekeeper’s ability doesn’t cause the combat phase or the declare attackers step to be skipped.
When the ability resolves, you choose whether to sacrifice the creature or perform the other action. If you can’t perform the other action, then you must sacrifice the creature.
