Cheapest priced copy (Gatecrash): $0.79 at Card Kingdom, near mint, their price list as of .
Immortal Servitude 
Sorcery · Rare · Gatecrash · #220
Return each creature card with mana value X from your graveyard to the battlefield.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.79 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Gatecrash | 220 | Rare | $0.79 | $2.49 |
One ruling from Wizards of the Coast
- 24 January 2013If a creature card in a graveyard has X in its mana cost, that X is considered to be 0.