Cheapest priced copy (Hour of Devastation): $0.35 at Card Kingdom, near mint, their price list as of .
Blur of Blades 
Instant · Common · Hour of Devastation · #84
Put a -1/-1 counter on target creature. Blur of Blades deals 2 damage to that creature's controller.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Hour of Devastation | 84 | Common | $0.35 | $0.49 |
| The List | HOU-84 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 14 July 2017If the targeted creature is an illegal target by the time Blur of Blades resolves, it won’t resolve and none of its effects will happen. Blur of Blades won’t deal damage to any player.