Cheapest priced copy (Foundations Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Seraph of the Sword 
Creature — Angel · 3/3 · Rare · Magic 2014 · #31
Flying
Prevent all combat damage that would be dealt to this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.49 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Commander | 48 | Rare | $0.49 | — |
| Magic 2014 | 31 | Rare | $0.69 | $2.49 |
One ruling from Wizards of the Coast
- 1 July 2013If Seraph of the Sword blocks a creature with trample, that creature’s controller must assign 3 damage to Seraph of the Sword (assuming it’s blocking no other creatures, there was no damage marked on it, and nothing has changed its toughness). The remainder can be assigned to the defending player or planeswalker.