Cheapest priced copy (Khans of Tarkir): $0.35 at Card Kingdom, near mint, their price list as of .
Rush of Battle 
Sorcery · Common · Khans of Tarkir · #19
Creatures you control get +2/+1 until end of turn. Warrior creatures you control gain lifelink until end of turn. (Damage dealt by those Warriors also causes their controller to gain that much life.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Khans of Tarkir | 19 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 20 September 2014Warrior creatures you control as Rush of Battle resolves gain lifelink in addition to getting +2/+1.