Cheapest priced copy (Magic 2010): $1.29 at Card Kingdom, near mint, their price list as of .
Guardian Seraph 
Creature — Angel · 3/4 · Rare · Magic 2010 · #13
Flying
If a source an opponent controls would deal damage to you, prevent 1 of that damage.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $1.29 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2010 | 13 | Rare | $1.29 | $4.49 |
3 rulings from Wizards of the Coast
- 1 October 2009The effects from multiple Guardian Seraphs are cumulative.
- 1 October 2009Spells and permanents have controllers, but cards that aren’t on the stack or the battlefield don’t. If a source without a controller (such as a cycled Jund Sojourners, for example) would deal damage to you, 1 of that damage is prevented if an opponent owns that source.
- 1 October 2009This ability prevents 1 damage from each source an opponent controls each time that source would deal damage to you. It prevents 1 of any damage, not just combat damage.