Cheapest priced copy (Eldritch Moon): $0.59 at Card Kingdom, near mint, their price list as of .
Ulvenwald Observer 
Creature — Treefolk · 6/6 · Rare · Eldritch Moon · #176
Whenever a creature you control with toughness 4 or greater dies, draw a card.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.59 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eldritch Moon | 176 | Rare | $0.59 | $1.49 |
| Eldritch Moon Promos | 176 | Rare | — | $0.79 |
| Eldritch Moon Promos | 176s | Rare | — | $0.69 |
2 rulings from Wizards of the Coast
- 13 July 2016If Ulvenwald Observer’s toughness is still 4 or greater at the time it dies, its ability triggers.
- 13 July 2016If Ulvenwald Observer dies at the same time as other creatures with toughness 4 or greater, its ability will trigger for each of those creatures.