Cheapest priced copy (Duel Decks: Garruk vs. Liliana): $0.35 at Card Kingdom, near mint, their price list as of .
Keening Banshee 
Creature — Spirit · 2/2 · Uncommon · RNA Guild Kit · #31
Flying
When this creature enters, target creature gets -2/-2 until end of turn.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
5 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Garruk vs. Liliana | 44 | Uncommon | $0.35 | — |
| RNA Guild Kit | 31 | Uncommon | $0.35 | — |
| Duel Decks Anthology: Garruk vs. Liliana | 44 | Uncommon | $0.49 | — |
| Salvat 2005 | E15 | Uncommon | — | — |
| Ravnica: City of Guilds | 92 | Uncommon | $0.35 | $0.49 |