Cheapest priced copy (Innistrad: Double Feature): $0.35 at Card Kingdom, near mint, their price list as of .
Moldgraf Millipede 
Creature — Insect Horror · 2/2 · Common · Duskmourn: House of Horror Commander · #188
When this creature enters, mill three cards, then put a +1/+1 counter on this creature for each creature card in your graveyard. (To mill three cards, put the top three cards of your library into your graveyard.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
6 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 476 | Common | $0.35 | $0.99 |
| Duskmourn: House of Horror Commander | 188 | Common | $0.35 | — |
| Innistrad Remastered | 208 | Common | $0.35 | $0.49 |
| Jumpstart 2022 | 691 | Common | $0.35 | — |
| Foundations Jumpstart | 690 | Common | $0.35 | — |
| Innistrad: Crimson Vow | 209 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 19 November 2021Moldgraf Millipede gets a +1/+1 counter for every creature card in your graveyard, including any creature cards that were already there before you milled three cards.