Rimefeather Owl 
Snow Creature — Bird
$1.86 #12610 0.25 20.1 years
Flying
Rimefeather Owl's power and toughness are each equal to the number of snow permanents on the battlefield.
: Put an ice counter on target permanent.Permanents with ice counters on them are snow.
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Cards similar to Rimefeather Owl 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 Treefolk95%
$0.24↓#124430.12↓7.2 years↓
"this card's power and toughness are each equal to the number of snow permanents you control."
Beast of Burden88%
$0.47↓#17720↓0.09↓27.6 years↑
"this card's power and toughness are each equal to the number of creatures on the battlefield."
Drift of the Dead88%
$0.23↓#23693↓0.2931.3 years↑
"this card's power and toughness are each equal to the number of snow lands you control."
Crusader of Odric88%
$0.15↓#123010.3014.1 years↓
"this card's power and toughness are each equal to the number of creatures you control."
Scion of the Wild88%
$0.17↓#23595↓0.2820.9 years
"this card's power and toughness are each equal to the number of creatures you control."
Battle Squadron88%
$0.22↓#101510.00↓26.9 years↑
"this card's power and toughness are each equal to the number of creatures you control."
Burrowguard Mentor88%
$0.27↓#6580↑0.172.1 years↓
"this card's power and toughness are each equal to the number of creatures you control."
Geist-Honored Monk87%
$0.28↓#8539↑0.06↓14.9 years↓
"this card's power and toughness are each equal to the number of creatures you control."
Regal Bunnicorn86%
$0.57↓#6326↑0.44↑3.0 years↓
"this card's power and toughness are each equal to the number of nonland permanents you control."
Faerie Swarm85%
$0.18↓#17914↓0.2918.3 years↓
"this card's power and toughness are each equal to the number of blue permanents you control."
Silverwing Squadron84%
$0.34↓#4964↑0.236.9 years↓
"this card's power and toughness are each equal to the number of creatures you control."
Kithkin Rabble84%
$0.33↓#20993↓0.00↓18.3 years↓
"this card's power and toughness are each equal to the number of white permanents you control."
Drove of Elves82%
$0.52↓#142630.64↑18.3 years↓
"this card's power and toughness are each equal to the number of green permanents you control."
Seraph of the Masses82%
$0.13↓#142490.3512.1 years↓
"this card's power and toughness are each equal to the number of creatures you control."
Freedom Fighter Recruit82%
$0.13↓#21437↓0.00↓0.8 years↓
"this card's power is equal to the number of creatures you control."
Snow Villiers82%
$0.17↓#15502↓0.341.2 years↓
"this card's power is equal to the number of creatures you control."
Soulsurge Elemental82%
$0.28↓#28869↓0.00↓16.4 years↓
"this card's power is equal to the number of creatures you control."
Horde of Boggarts82%
$0.30↓#20347↓0.56↑18.3 years↓
"this card's power and toughness are each equal to the number of red permanents you control."
Altar Golem81%
$0.47↓#20294↓0.07↓18.1 years↓
"this card's power and toughness are each equal to the number of creatures on the battlefield."
Crowd of Cinders80%
$0.17↓#27809↓0.2918.3 years↓
"this card's power and toughness are each equal to the number of black permanents you control."