Greenside Watcher is a creature card from Magic: The Gathering's Gatecrash set, printed at an Unknown rarity and currently valued at $0.07. The description and mechanics place it among lower-demand commons and uncommons typical of limited play or casual green decks. Collectors view it as a low-value filler piece useful for completing set playsets or cube builds rather than as a market mover. Market price reflects minimal demand and common availability.