Cheapest priced copy (Ravnica: City of Guilds): $0.49 at Card Kingdom, near mint, their price list as of .
Woodwraith Corrupter 
Creature — Elemental Horror · 3/6 · Rare · Ravnica: City of Guilds · #240
{1}{B}{G}, {T}: Target Forest becomes a 4/4 black and green Elemental Horror creature. It's still a land.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ravnica: City of Guilds | 240 | Rare | $0.49 | $0.79 |
2 rulings from Wizards of the Coast
- 1 October 2005The effect has no stated duration, so a land turned into a creature this way continues being a creature as long as the land is on the battlefield.
- 1 August 2008A noncreature permanent that turns into a creature can attack, and its {T} abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn’t matter how long the permanent has been a creature.