Cheapest priced copy (Scars of Mirrodin): $0.69 at Card Kingdom, near mint, their price list as of .
Assault Strobe 
Sorcery · Common · Scars of Mirrodin · #82
Target creature gains double strike until end of turn. (It deals both first-strike and regular combat damage.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.69 to $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Scars of Mirrodin | 82 | Common | $0.69 | $12.99 |