Cheapest priced copy (Born of the Gods): $0.35 at Card Kingdom, near mint, their price list as of .
Graverobber Spider 
Creature — Spider · 2/4 · Uncommon · Born of the Gods · #122
Reach
{3}{B}: This creature gets +X/+X until end of turn, where X is the number of creature cards in your graveyard. Activate only once each turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Born of the Gods | 122 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 February 2014The number of creature cards in your graveyard is counted only as the ability resolves. Once the ability resolves, the bonus won't change, even if the number of creature cards in your graveyard changes later in the turn.