Cheapest priced copy (Scars of Mirrodin): $0.35 at Card Kingdom, near mint, their price list as of .
Auriok Replica 
Artifact Creature — Cleric · 2/2 · Common · Scars of Mirrodin · #138
{W}, Sacrifice this creature: Prevent all damage a source of your choice would deal to you this turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Scars of Mirrodin | 138 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 January 2011You choose a source of damage as the ability resolves. Since the ability doesn’t target the source, you could choose a source with protection from artifacts, for example.
- 1 January 2011If the chosen source would deal damage to you and to other creatures, players, and/or planeswalkers, only the damage that would be dealt to you is prevented.