Rimefeather Owl [Coldsnap] 015 you may gain life equal

you may gain life equal to that creature's power

Set: Magic 2012 Type: Artifact Rarity: Rare Cost: {2} {1}

You must also Tribute monsters from the field or your hand whose total Levels equal the Level of the Ritual Monster you are attempting to Ritual Summon

Set: Commander 2017 Type: Enchantment Rarity: Rare Cost: {3}{B}{B} Whenever you gain life

Rimefeather Owl [Coldsnap] 015 you may gain life equalSet: Coldsnap Type: Snow Creature Bird Rarity: Rare Cost: {5}{U}{U} 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.