Cheapest priced copy (Prophecy): $4.99 at Card Kingdom, near mint, their price list as of .
Infernal Genesis 
Enchantment · Rare · Prophecy · #68
At the beginning of each player's upkeep, that player mills a card. Then they create X 1/1 black Minion creature tokens, where X is the milled card's mana value.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $4.99 to $49.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Prophecy | 68 | Rare | $4.99 | $49.99 |
One ruling from Wizards of the Coast
- 1 August 2008If the card has no mana cost (for instance, if it's a land), then its mana value is 0. This means no tokens will be created.