Cheapest priced copy (Commander 2020): $0.49 at Card Kingdom, near mint, their price list as of .
Unexpectedly Absent 
Instant · Rare · Commander 2020 · #106
Put target nonland permanent into its owner's library just beneath the top X cards of that library.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $0.49 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2013 | 25 | Rare | $0.59 | — |
| Commander 2020 | 106 | Rare | $0.49 | — |
| Commander Anthology | 27 | Rare | $0.49 | — |
| Eternal Masters | 33 | Rare | $0.59 | $6.99 |
2 rulings from Wizards of the Coast
- 8 June 2016If you choose 0 as the value for X, put that permanent on top of its owner’s library.
- 8 June 2016If there are fewer than X cards in that player’s library, put that permanent on the bottom of that library.