Cheapest priced copy (Legends): $12.99 at Card Kingdom, near mint, their price list as of .
Quarum Trench Gnomes 
Creature — Gnome · 1/1 · Rare · Legends · #162
{T}: If target Plains is tapped for mana, it produces colorless mana instead of white mana. (This effect lasts indefinitely.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Legends | 162 | Rare | $12.99 | — |
One ruling from Wizards of the Coast
- 1 August 2008The ability only replaces white mana produced by the Plains. If a Plains somehow tries to produce mana of a different color (for instance, if you control a Joiner Adept), this effect will not cause it to produce colorless mana.