Cheapest priced copy (Fifth Dawn): $0.35 at Card Kingdom, near mint, their price list as of .
Blind Creeper 
Creature — Zombie Beast · 3/3 · Common · Fifth Dawn · #42
Whenever a player casts a spell, this creature gets -1/-1 until end of turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fifth Dawn | 42 | Common | $0.35 | $0.49 |
| Salvat 2005 | F4 | Common | — | — |
| Salvat 2005 | F29 | Common | — | — |
One ruling from Wizards of the Coast
- 1 December 2004This ability triggers off anyone casting a spell, including you, not just Blind Creeper’s controller or an opponent.