Cheapest priced copy (Mirrodin Besieged): $0.35 at Card Kingdom, near mint, their price list as of .
Frantic Salvage 
Instant · Common · Mirrodin Besieged · #6
Put any number of target artifact cards from your graveyard on top of your library.
Draw a card.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin Besieged | 6 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 June 2011You choose the order of the cards you put on top of your library.
- 1 June 2011You can cast this with zero targets. If you do, you’ll get to draw a card. However, if you cast this with at least one target and all of those targets become illegal (because another effect has removed them from the graveyard, perhaps), the spell won’t resolve and you won’t get to draw a card.