Cheapest priced copy (Mirage): $0.79 at Card Kingdom, near mint, their price list as of .
Bone Mask 
Artifact · Rare · Mirage · #295
{2}, {T}: The next time a source of your choice would deal damage to you this turn, prevent that damage. Exile cards from the top of your library equal to the damage prevented this way.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirage | 295 | Rare | $0.79 | — |
One ruling from Wizards of the Coast
- 4 October 2004If you do not have enough cards in your library, the damage is still prevented and all the cards in your library are exiled.