Cheapest priced copy (Eldritch Moon): $0.35 at Card Kingdom, near mint, their price list as of .
Mercurial Geists 
Creature — Spirit · 1/3 · Uncommon · Eldritch Moon · #186
Flying
Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eldritch Moon | 186 | Uncommon | $0.35 | $0.49 |
| The List | EMN-186 | Uncommon | $0.35 | — |