Cheapest priced copy (Dark Ascension): $0.35 at Card Kingdom, near mint, their price list as of .
Clinging Mists 
Instant · Common · Dark Ascension · #109
Prevent all combat damage that would be dealt this turn.
Fateful hour — If you have 5 or less life, tap all attacking creatures. Those creatures don't untap during their controller's next untap step.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dark Ascension | 109 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 22 January 2011In most cases, attacking creatures will already be tapped. They still won’t untap during their controller’s next untap step.
- 22 January 2011Clinging Mists doesn’t track the controller of the attacking creatures. If one of them changes controller before its previous controller’s next untap step, it won’t untap during its new controller’s next untap step.