Cheapest priced copy (Conflux): $0.35 at Card Kingdom, near mint, their price list as of .
Corrupted Roots 
Enchantment — Aura · Uncommon · Conflux · #41
Enchant Forest or Plains
Whenever enchanted land becomes tapped, its controller loses 2 life.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conflux | 41 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 February 2009Corrupted Roots doesn’t care why the enchanted land becomes tapped. If that land changes from being untapped to being tapped for any reason, the ability will trigger.
- 1 February 2009Corrupted Roots can enchant only a Forest or a Plains. It checks the enchanted land’s subtypes, not its name. If at any time the enchanted land is neither a Forest nor a Plains (due to Unstable Frontier’s ability, perhaps), Corrupted Roots is put into its owner’s graveyard as a state-based action.