Rimefeather Owl is a rare Snow Creature — Bird card from Coldsnap (CSP), collector number 42. Current market price: $1.94 (foil $37.29), TCGplayer market prices via Scryfall.
Flying Rimefeather Owl's power and toughness are each equal to the number of snow permanents on the battlefield. {1}{S}: Put an ice counter on target permanent. Permanents with ice counters on them are snow.