Cheapest priced copy (Mirrodin): $0.35 at Card Kingdom, near mint, their price list as of .
Clockwork Beetle 
Artifact Creature — Insect · 0/0 · Common · Mirrodin · #153
This creature enters with two +1/+1 counters on it.
Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin | 153 | Common | $0.35 | $0.49 |