Peacekeeper
Creature — Human
At the beginning of your upkeep, sacrifice this creature unless you pay 
.
Creatures can't attack.
"I have always imagined my mother as such a woman, strong and wise." —Sisay, journal
Donato Giancola
Weatherlight (WTH)
• #22Rulings
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.
(wotc • 2008-04-01)
Peacekeeper’s ability doesn’t cause the combat phase or the declare attackers step to be skipped.
(wotc • 2008-04-01)
If the creature is no longer on the battlefield when the ability resolves, you may still perform the action if you want.
(wotc • 2008-04-01)
Rulings
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.
(wotc • 2008-04-01)
Peacekeeper’s ability doesn’t cause the combat phase or the declare attackers step to be skipped.
(wotc • 2008-04-01)
If the creature is no longer on the battlefield when the ability resolves, you may still perform the action if you want.
(wotc • 2008-04-01)