Cheapest priced copy (Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Awakener Druid 
Creature — Human Druid · 1/1 · Uncommon · Magic 2010 · #167
When this creature enters, target Forest becomes a 4/5 green Treefolk creature for as long as this creature remains on the battlefield. It's still a land.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart | 379 | Uncommon | $0.35 | — |
| Magic 2010 | 167 | Uncommon | $0.35 | $0.49 |
| Magic 2011 | 163 | Uncommon | $0.35 | $0.49 |
5 rulings from Wizards of the Coast
- 1 October 2009If Awakener Druid and the Treefolk are dealt lethal damage at the same time, both will be destroyed. However, if Awakener Druid leaves the battlefield before the Treefolk is dealt damage, it will immediately revert to being just a land and thus can't be dealt damage.
- 1 October 2009Awakener Druid's ability affects a land with the land type Forest, not necessarily a land with the name Forest.
- 1 October 2009If the targeted Forest entered this turn, it will be affected by "summoning sickness" once it becomes a Treefolk. You won't be able to attack with it or use its activated abilities that have {T} in the cost (including its mana ability).
- 1 October 2009Awakener Druid's ability is mandatory. When it enters, you must target a Forest (if there is one), even if you don't control that Forest.
- 1 October 2009If Awakener Druid leaves the battlefield before its "enters" ability resolves, nothing happens to the targeted Forest when that ability resolves. It won't become a creature.