Cheapest priced copy (Ravnica: Clue Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Oust 
Sorcery · Uncommon · The List · #DDP-7
Put target creature into its owner's library second from the top. Its controller gains 3 life.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
4 printings · $0.35 to $24.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ravnica: Clue Edition | 67 | Uncommon | $0.35 | — |
| Duel Decks: Zendikar vs. Eldrazi | 7 | Uncommon | $0.39 | — |
| The List | DDP-7 | Uncommon | $0.35 | — |
| Rise of the Eldrazi | 40 | Uncommon | $0.49 | $24.99 |
5 rulings from Wizards of the Coast
- 15 June 2010If the targeted creature’s owner has one or more cards in their library, that creature is put into that library directly under the top card.
- 15 June 2010If the targeted creature is an illegal target by the time Oust resolves, the spell doesn’t resolve. No one gains life.
- 15 June 2010Note that the creature’s controller, not its owner, is the one who gains life.
- 15 June 2010If the targeted creature’s owner has no cards left in their library, that creature is put into that library as the only card there.
- 15 June 2010If the targeted creature is a token, it will cease to exist after it’s put into its owner’s library.