Cheapest priced copy (Mirrodin): $0.35 at Card Kingdom, near mint, their price list as of .
Duskworker 
Artifact Creature — Construct · 2/2 · Uncommon · Mirrodin · #166
Whenever this creature becomes blocked, regenerate it.
{3}: This creature gets +1/+0 until end of turn.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin | 166 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 December 2004Setting up the regeneration shield doesn't remove Duskworker from combat. However, Duskworker is removed from combat if it would be destroyed and then regenerates.