Cheapest priced copy (Dark Ascension): $0.35 at Card Kingdom, near mint, their price list as of .
Altar of the Lost 
Artifact · Uncommon · Dark Ascension · #144
This artifact enters tapped.
{T}: Add two mana in any combination of colors. Spend this mana only to cast spells with flashback from a graveyard.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dark Ascension | 144 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 22 January 2011You can spend mana produced by Altar of the Lost to cast any spell with flashback that you cast from a graveyard. You don’t have to be using flashback to cast that spell, however, as long as something else is allowing you to cast that spell.
- 22 January 2011Altar of the Lost doesn’t allow you to cast spells from any other player’s graveyard, although you can spend the mana it produces on such spells if something else allows you to.