Clinging Mists is a common Instant card from Dark Ascension (DKA), collector number 109. Current market price: $0.18 (foil $0.32), TCGplayer market prices via Scryfall.
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.