Wall of Diffusion 
Creature — Wall
$0.12 #28626 0.00 29.0 years
Defender (This creature can't attack.)
This creature can block creatures with shadow as though it had shadow.
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Cards similar to Wall of Diffusion 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.
Heartwood Dryad100%
$0.14↑#310420.0029.0 years
"This creature can block creatures with shadow as though it had shadow."
Aetherflame Wall98%
$0.10↓#240150.0720.0 years↓
"This creature can block creatures with shadow as though they didn't have shadow."
+1 more matching line
Dauthi Cutthroat88%
$0.45↑#17452↑0.0028.3 years
"Shadow"
Faceless Devourer85%
$0.10↓#249810.0620.0 years↓
"Shadow"
Pride Guardian82%
$0.12#17422↑0.0515.3 years↓
"Defender"
Wall of Corpses82%
$0.14↑#252840.0030.0 years↑
"Defender"
Psychic Membrane81%
$0.21↑#17465↑0.0623.0 years↓
"Defender"
Wall of Vipers80%
$0.17↑#292080.11↑26.4 years↓
"Defender"
Kaijin of the Vanishing Touch79%
$0.32↑#234040.38↑21.7 years↓
"Defender"
Wall of Tears79%
$0.31↑#12643↑0.40↑28.6 years
"Defender"
Dauthi Ghoul78%
$0.87↑#15327↑0.12↑29.0 years
"Shadow"
Wall of Razors78%
$0.31↑#21851↑0.18↑28.6 years
"Defender"
Wall of Ice78%
$0.31↑#17299↑0.0633.2 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"
Wall of Torches78%
$0.25↑#255640.0515.3 years↓
"Defender"