Cheapest priced copy (Nemesis): $4.99 at Card Kingdom, near mint, their price list as of .
Kill Switch 
Artifact · Rare · Nemesis · #133
{2}, {T}: Tap all other artifacts. They don't untap during their controllers' untap steps for as long as this artifact remains tapped.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $4.99 to $64.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Nemesis | 133 | Rare | $4.99 | $64.99 |
2 rulings from Wizards of the Coast
- 4 October 2004Only the artifacts that it tried to tap when the ability resolved are prevented from untapping. Artifacts that enter after that or permanents that become artifacts after that are not affected.
- 4 October 2004Note that you can't choose to leave this card tapped during your untap step (unless some other effect says so).