Cheapest priced copy (War of the Spark): $0.59 at Card Kingdom, near mint, their price list as of .
Pledge of Unity 
Instant · Uncommon · War of the Spark · #210
Put a +1/+1 counter on each creature you control. You gain 1 life for each creature you control.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.59 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| War of the Spark | 210 | Uncommon | $0.59 | $0.99 |