Cheapest priced copy (Coldsnap): $0.35 at Card Kingdom, near mint, their price list as of .
Krovikan Whispers 
Enchantment — Aura · Uncommon · Coldsnap · #39
Enchant creature
Cumulative upkeep {U} or {B} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
You control enchanted creature.
When this Aura is put into a graveyard from the battlefield, you lose 2 life for each age counter on it.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Coldsnap | 39 | Uncommon | $0.35 | $0.49 |