Cheapest priced copy (Duskmourn: House of Horror Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Brainstone 
Artifact · Uncommon · Duskmourn: House of Horror Commander · #242
{2}, {T}, Sacrifice this artifact: Draw three cards, then put two cards from your hand on top of your library in any order.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duskmourn: House of Horror Commander | 242 | Uncommon | $0.49 | — |
| Modern Horizons 2 | 223 | Uncommon | $0.59 | $0.49 |
| Modern Horizons 2 | 426 | Uncommon | $0.59 | $0.79 |