Wall of Frost 
Creature — Wall
$0.20 #4932 0.67 17.3 years
Defender
Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step.
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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.
Cleric of Chill Depths99%
$0.21↑#23606↓0.15↓6.1 years↓
"Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."
Labyrinth Minotaur99%
$0.11↓#30464↓0.33↓31.1 years↑
"Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."
Vertigo Spawn96%
$0.07↓#26853↓0.31↓20.7 years↑
"Whenever this creature blocks a creature, tap that creature. That creature doesn't untap during its controller's next untap step."
+1 more matching line
Psychic Membrane94%
$0.21↑#17465↓0.06↓23.0 years↑
"Defender"
Mindbender Spores86%
$1.42↑#22216↓0.6330.0 years↑
"Whenever this creature blocks a creature, put four fungus counters on that creature. The creature gains "This creature doesn't untap during your untap step if it has a fungus counter on it" and "At the beginning of your upkeep, remove a fungus counter from this creature.""
+1 more matching line
Stoic Ephemera86%
$0.10↓#28010↓0.00↓20.5 years↑
"Defender"
Wall of Corpses84%
$0.14↓#25284↓0.00↓30.0 years↑
"Defender"
Ageless Sentinels84%
$0.28↑#26635↓0.00↓23.4 years↑
"Defender"
Wall of Dust83%
$0.23↑#26043↓0.06↓32.4 years↑
"Whenever this creature blocks a creature, that creature can't attack during its controller's next turn."
+1 more matching line
Wall of Vapor83%
$0.13↓#22427↓0.11↓32.4 years↑
"Defender"
Pride Guardian82%
$0.12↓#17422↓0.05↓15.3 years↓
"Whenever this creature blocks, you gain 3 life."
+1 more matching line
Sanctuary Wall82%
$0.23↑#18295↓0.35↓2.7 years↓
"Defender"
Shield of the Righteous82%
$0.23↑#24854↓0.36↓17.5 years
"Whenever equipped creature blocks a creature, that creature doesn't untap during its controller's next untap step."
Flailing Drake82%
$0.14↓#32274↓0.00↓29.0 years↑
"Whenever this creature blocks or becomes blocked by a creature, that creature gets +1/+1 until end of turn."
Kaijin of the Vanishing Touch82%
$0.32↑#23404↓0.38↓21.7 years↑
"Whenever this creature blocks a creature, return that creature to its owner's hand at end of combat."
+1 more matching line
Wall of Tears82%
$0.31↑#12643↓0.40↓28.6 years↑
"Whenever this creature blocks a creature, return that creature to its owner's hand at end of combat."
+1 more matching line
Brimaz, King of Oreskos82%
$7.04↑#3037↑0.24↓12.7 years↓
"Whenever this card blocks a creature, create a 1/1 white Cat Soldier creature token with vigilance that's blocking that creature."
Zhao Zilong, Tiger General80%
$108.80↑#26434↓0.39↓27.5 years↑
"Whenever this card blocks, it gets +1/+1 until end of turn."
Goldenglow Moth80%
$0.11↓#19166↓0.12↓18.5 years↑
"Whenever this creature blocks, you may gain 4 life."
Wall of Razors80%
$0.31↑#21851↓0.18↓28.6 years↑
"Defender"