Wall of Diffusion 
Creature — Wall
$0.10 #28355 0.00 28.9 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%
$0.18↑#307690.29↑28.9 years
"This creature can block creatures with shadow as though it had shadow."
Aetherflame Wall98%
$0.07↓#237160.33↑19.9 years↓
"This creature can block creatures with shadow as though they didn't have shadow."
+1 more matching line
Dauthi Cutthroat88%
$0.41↑#17610↑0.76↑28.2 years
"Shadow"
Faceless Devourer85%
$0.11↑#249310.33↑19.9 years↓
"Shadow"
Pride Guardian82%
$0.13↑#17371↑0.0015.1 years↓
"Defender"
Wall of Corpses82%
$0.12↑#251030.33↑29.9 years↑
"Defender"
Psychic Membrane81%
$0.20↑#17329↑0.27↑22.9 years↓
"Defender"
Wall of Vipers80%
$0.18↑#289230.24↑26.3 years↓
"Defender"
Kaijin of the Vanishing Touch79%
$0.39↑#231110.56↑21.6 years↓
"Defender"
Wall of Tears79%
$0.35↑#12504↑0.43↑28.5 years
"Defender"
Dauthi Ghoul78%
$0.72↑#15370↑0.55↑28.9 years
"Shadow"
Blistering Barrier78%
$0.12↑#282290.36↑29.9 years↑
"Defender"
Wall of Ice78%
$0.31↑#17029↑0.0033.1 years↑
"Defender"
Custodian of the Trove78%
$0.04↓#275320.0011.4 years↓
"Defender"
Archers of Qarsi78%
$0.05↓#254890.22↑11.6 years↓
"Defender"
Wall of Wood78%
$0.08↓#241900.0733.1 years↑
"Defender"
Fortified Rampart78%
$0.25↑#9740↑0.0010.9 years↓
"Defender"
Carnivorous Plant78%
$0.10#283910.24↑32.1 years↑
"Defender"
Murmuring Phantasm78%
$0.10#19136↑0.0013.3 years↓
"Defender"
Wall of Mist78%
$0.10#15493↑0.33↑8.1 years↓
"Defender"