Cheapest priced copy (Return to Ravnica): $0.35 at Card Kingdom, near mint, their price list as of .
Chorus of Might 
Instant · Common · Return to Ravnica · #119
Until end of turn, target creature gets +1/+1 for each creature you control and gains trample.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Return to Ravnica | 119 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 October 2012The number of creatures you control is counted only when Chorus of Might resolves.