Cheapest priced copy (Ravnica: Clue Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Corpse Churn 
Instant · Common · Ikoria: Lair of Behemoths · #81
Mill three cards, then you may return a creature card from your graveyard to your hand. (To mill three cards, put the top three cards of your library into your graveyard.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
5 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ravnica: Clue Edition | 107 | Common | $0.35 | — |
| Commander Legends | 113 | Common | $0.35 | $0.49 |
| Ikoria: Lair of Behemoths | 81 | Common | $0.35 | $0.49 |
| Jumpstart 2022 | 389 | Common | $0.35 | — |
| Oath of the Gatewatch | 83 | Common | $0.35 | $0.99 |
One ruling from Wizards of the Coast
- 10 November 2020Because Corpse Churn doesn't target the creature card in your graveyard, you may choose one of the three cards you put there from your library if applicable.