Cheapest priced copy (The List): $0.59 at Card Kingdom, near mint, their price list as of .
Cogwork Librarian 
Artifact Creature — Construct · 3/3 · Common · Conspiracy · #58
Draft this card face up.
As you draft a card, you may draft an additional card from that booster pack. If you do, put this card into that booster pack.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $0.59 to $10.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conspiracy | 58 | Common | $0.79 | $10.99 |
| The List | CNS-58 | Common | $0.59 | — |
3 rulings from Wizards of the Coast
- 29 May 2014The two cards you draft are drafted one at a time, in case one of the cards cares about when it was drafted or what the next card you draft is.
- 29 May 2014You may use the ability of more than one Cogwork Librarian while drafting from one booster pack. For example you can draft three cards from one booster pack and put two Cogwork Librarians into that booster pack.
- 29 May 2014Cogwork Librarian essentially lets you draft two cards from a booster pack in exchange for putting Cogwork Librarian back into that booster pack.