Cheapest priced copy (Secrets of Strixhaven Commander): $0.39 at Card Kingdom, near mint, their price list as of .
Perpetual Timepiece 
Artifact · Uncommon · Secrets of Strixhaven Commander · #354
{T}: Mill two cards. (Put the top two cards of your library into your graveyard.)
{2}, Exile this artifact: Shuffle any number of target cards from your graveyard into your library.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.39 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kaladesh | 227 | Uncommon | $0.59 | $11.99 |
| Outlaws of Thunder Junction Commander | 263 | Uncommon | $0.49 | — |
| The List | KLD-227 | Uncommon | $0.59 | — |
| Secrets of Strixhaven Commander | 354 | Uncommon | $0.39 | — |
One ruling from Wizards of the Coast
- 20 September 2016You can activate Perpetual Timepiece's second ability with no targets just to shuffle your library. If you choose any targets and they all become illegal targets, the ability won't resolve and you won't shuffle your library.