Wall of Dust 
Creature — Wall
$0.23 #26043 0.06 32.4 years
Defender (This creature can't attack.)
Whenever this creature blocks a creature, that creature can't attack during its controller's next turn.
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Cards similar to Wall of Dust 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.
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"Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."
+1 more matching line
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$0.14↓#252840.0030.0 years↓
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$0.28↑#266350.0023.4 years↓
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$0.13↓#224270.1132.4 years
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Cleric of Chill Depths80%
$0.21↓#236060.156.1 years↓
"Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."
Labyrinth Minotaur80%
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"Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."
Wall of Vipers80%
$0.17↓#292080.1126.4 years↓
"Defender"
Wall of Razors78%
$0.31↑#218510.18↑28.6 years↓
"Defender"
Wall of Ice78%
$0.31↑#17299↑0.0633.2 years
"Defender"
Razorgrass Screen78%
$0.06↓#266980.0022.4 years↓
"Defender"
Moat Piranhas78%
$0.16↓#253470.007.3 years↓
"Defender"
Carnivorous Plant78%
$0.10↓#286330.0032.2 years
"Defender"
Murmuring Phantasm78%
$0.10↓#19501↑0.0013.5 years↓
"Defender"
Wall of Granite78%
$0.35↑#270020.0629.5 years↓
"Defender"
Steel Wall78%
$0.25↑#10348↑0.0023.0 years↓
"Defender"
Tundra Wall78%
$0.18↓#254900.040.9 years↓
"Defender"