Cheapest priced copy (Avacyn Restored): $0.35 at Card Kingdom, near mint, their price list as of .
Corpse Traders 
Creature — Human Rogue · 3/3 · Uncommon · Avacyn Restored · #90
{2}{B}, Sacrifice a creature: Target opponent reveals their hand. You choose a card from it. That player discards that card. Activate only as a sorcery.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avacyn Restored | 90 | Uncommon | $0.35 | $0.49 |
| Duel Decks: Jace vs. Vraska | 58 | Uncommon | $0.35 | — |
| Jumpstart | 220 | Uncommon | $0.35 | — |
2 rulings from Wizards of the Coast
- 1 May 2012You can sacrifice Corpse Traders to pay the cost of its ability.
- 15 April 2013If you cast this as normal during your main phase, it will enter the battlefield and you’ll receive priority. If no abilities trigger because of this, you can activate its ability immediately, before any other player has a chance to remove it from the battlefield.