Cheapest priced copy (Outlaws of Thunder Junction Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Leyline Dowser 
Artifact · Rare · Outlaws of Thunder Junction Commander · #75
{1}, {T}: Mill a card. You may put an instant or sorcery card milled this way into your hand.
Tap an untapped legendary creature you control: Untap this artifact.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Outlaws of Thunder Junction Commander | 39 | Rare | $0.49 | — |
| Outlaws of Thunder Junction Commander | 75 | Rare | $0.49 | — |
One ruling from Wizards of the Coast
- 12 April 2024You can tap any untapped legendary creature you control, including one you haven’t controlled continuously since the beginning of your most recent turn, to pay the cost of Leyline Dowser’s second activated ability.