Peacekeeper
About this card
Peacekeeper is a creature card in Magic: The Gathering with mana value 3 (color identity: white). Printed in Weatherlight (1997). Legal in Commander, Legacy and Vintage. Cardmarket price: €8.10. It is on the Reserved List: Wizards will not reprint it.
Peacekeeper 

Creatures can't attack.
"I have always imagined my mother as such a woman, strong and wise." —Sisay, journal
Name in each language
Legality
Rulings
2008-04-01
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.
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.
2008-04-01
Peacekeeper’s ability doesn’t cause the combat phase or the declare attackers step to be skipped.