Cheapest priced copy (New Phyrexia): $0.35 at Card Kingdom, near mint, their price list as of .
Leeching Bite 
Instant · Common · New Phyrexia · #113
Target creature gets +1/+1 until end of turn. Another target creature gets -1/-1 until end of turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| New Phyrexia | 113 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 June 2011You need to be able to choose two different target creatures in order to cast Leeching Bite.
- 1 June 2011If only one of the targeted creatures is still a legal target when Leeching Bite tries to resolve, that creature will still be affected, but the illegal target won’t be.