Cheapest priced copy (Kaladesh): $0.35 at Card Kingdom, near mint, their price list as of .
Rush of Vitality 
Instant · Common · Kaladesh · #99
Target creature gets +1/+0 and gains lifelink and indestructible until end of turn. (Damage dealt by that creature also causes its controller to gain that much life, and it can't be destroyed by damage or effects that say "destroy.")
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard