Cheapest priced copy (Coldsnap): $0.49 at Card Kingdom, near mint, their price list as of .
Frostweb Spider 
Snow Creature — Spider · 1/3 · Common · Coldsnap · #109
Reach (This creature can block creatures with flying.)
Whenever this creature blocks a creature with flying, put a +1/+1 counter on this creature at end of combat.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Coldsnap | 109 | Common | $0.49 | $0.79 |
2 rulings from Wizards of the Coast
- 15 July 2006If Frostweb Spider blocks a creature with flying that’s just powerful enough to kill it, it will die before it can get the +1/+1 counter.
- 15 July 2006If Frostweb Spider somehow blocks more than one creature with flying during the same combat, its ability will trigger multiple times.