Cheapest priced copy (Warhammer 40,000 Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Technomancer 
Artifact Creature — Necron Wizard · 5/1 · Rare · Warhammer 40,000 Commander · #61
When this creature enters, mill three cards, then return any number of artifact creature cards with total mana value 6 or less from your graveyard to the battlefield.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Warhammer 40,000 Commander | 61 | Rare | $0.49 | — |
| Warhammer 40,000 Commander | 61★ | Rare | — | — |
2 rulings from Wizards of the Coast
- 7 October 2022If a card in your graveyard has an {X} in its mana cost, X is zero.
- 7 October 2022The artifact creature cards you choose don't need to be cards that you milled. You may choose cards that were already in your graveyard before you milled.