Rimefeather Owl 


Snow Creature — Bird
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.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Abominable Treefolk 83%
$0.25#12172
"this card's power and toughness are each equal to the number of snow permanents you control."
Ixidron 80%
$0.37#7683
"this card's power and toughness are each equal to the number of face-down creatures on the battlefield."
Doubtless One 80%
$0.21#21188
"this card's power and toughness are each equal to the number of Clerics on the battlefield."