Cheapest priced copy (March of the Machine): $0.79 at Card Kingdom, near mint, their price list as of .
Unseal the Necropolis 
Instant · Common · March of the Machine · #128
Each player mills three cards. Then you return up to two creature cards from your graveyard to your hand. (To mill three cards, a player puts the top three cards of their library into their graveyard.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.79 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine | 128 | Common | $0.79 | $0.99 |
| The List | MOM-128 | Common | $0.79 | — |