Cheapest priced copy (Gatecrash): $0.35 at Card Kingdom, near mint, their price list as of .
Greenside Watcher 
Creature — Elf Druid · 2/1 · Common · Gatecrash · #122
{T}: Untap target Gate.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Gatecrash | 122 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 24 January 2013Greenside Watcher’s ability is not a mana ability. It uses the stack and can be responded to.