Cheapest priced copy (Eldritch Moon): $0.35 at Card Kingdom, near mint, their price list as of .
Geist of the Lonely Vigil 
Creature — Spirit Cleric · 2/3 · Uncommon · Eldritch Moon · #27
Defender, flying
Delirium — This creature can attack as though it didn't have defender as long as there are four or more card types among cards in your graveyard.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eldritch Moon | 27 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 13 July 2016Once you've attacked with Geist of the Lonely Vigil, lowering the number of card types in your graveyard won't remove it from combat.