Cheapest priced copy (Urza's Saga): $1.29 at Card Kingdom, near mint, their price list as of .
Whetstone 
Artifact · Rare · Urza's Saga · #316
{3}: Each player mills two cards.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $1.29 to $1.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Urza's Saga | 316 | Rare | $1.29 | — |
| World Championship Decks 2000 | nl316 | Rare | $1.79Out of stock | — |
3 rulings from Wizards of the Coast
- 4 October 2004It is not a draw effect so it will not cause a player with less than 2 cards in their library to lose.
- 4 October 2004Can be used if a player has less than 2 cards in their library. It will remove 0 or 1 cards if that is all that is available.
- 4 October 2004Since you are putting more than one card in the graveyard at one time, each affected player can choose the order the 2 cards go in.