Cheapest priced copy (Chronicles): $0.35 at Card Kingdom, near mint, their price list as of .
Runesword 
Artifact · Common · Chronicles · #106
{3}, {T}: Target attacking creature gets +2/+0 until end of turn. When that creature leaves the battlefield this turn, sacrifice this artifact. If the creature deals damage to a creature this turn, the creature dealt damage can't be regenerated this turn. If a creature dealt damage by the targeted creature would die this turn, exile that creature instead.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
4 printings · $0.35 to $0.69 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Chronicles Foreign Black Border | 106 | Common | — | — |
| Chronicles | 106 | Common | $0.35 | — |
| The Dark | 107 | Uncommon | $0.69 | — |
| The Dark | 107† | Uncommon | — | — |