Cheapest priced copy (Commander Masters): $1.49 at Card Kingdom, near mint, their price list as of .
Harsh Mercy 
Sorcery · Rare · Onslaught · #39
Each player chooses a creature type. Destroy all creatures that aren't of a type chosen this way. They can't be regenerated.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $1.49 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 825 | Rare | $1.49 | — |
| Onslaught | 39 | Rare | $2.29 | $11.99 |