Cheapest priced copy (Rise of the Eldrazi): $0.35 at Card Kingdom, near mint, their price list as of .
Unified Will 
Instant · Uncommon · Rise of the Eldrazi · #92
Counter target spell if you control more creatures than that spell's controller.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Rise of the Eldrazi | 92 | Uncommon | $0.35 | $1.99 |
One ruling from Wizards of the Coast
- 15 June 2010Whether you control more creatures than the targeted spell’s controller is checked only as Unified Will resolves. If that player controls more creatures than you at this time, or you each control the same amount, Unified Will simply doesn’t do anything.