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At the beginning of your upkeep, sacrifice this creature unless you pay


.
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.
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.
Peacekeeper’s ability doesn’t cause the combat phase or the declare attackers step to be skipped.