Cheapest priced copy (Duel Decks: Nissa vs. Ob Nixilis): $0.35 at Card Kingdom, near mint, their price list as of .
Squelching Leeches 
Creature — Leech · */* · Uncommon · Journey into Nyx · #84
Squelching Leeches's power and toughness are each equal to the number of Swamps you control.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Nissa vs. Ob Nixilis | 62 | Uncommon | $0.35 | — |
| Journey into Nyx | 84 | Uncommon | $0.35 | $0.49 |
| Journey into Nyx Promos | 84 | Uncommon | $0.39 | — |
2 rulings from Wizards of the Coast
- 26 April 2014Squelching Leeches's power and toughness will change as the number of Swamps you control changes. Its ability counts all lands you control with the subtype Swamp, not just those named Swamp.
- 26 April 2014The ability that defines Squelching Leeches's power and toughness works in all zones, not just the battlefield.