Cheapest priced copy (Weatherlight): $13.99 at Card Kingdom, near mint, their price list as of .
Peacekeeper 
Creature — Human · 1/1 · Rare · Weatherlight · #22
At the beginning of your upkeep, sacrifice this creature unless you pay {1}{W}.
Creatures can't attack.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $13.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Weatherlight | 22 | Rare | $13.99 | — |
3 rulings from Wizards of the Coast
- 1 April 2008When 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.
- 1 April 2008Peacekeeper’s ability doesn’t cause the combat phase or the declare attackers step to be skipped.
- 1 April 2008If the creature is no longer on the battlefield when the ability resolves, you may still perform the action if you want.