Wall of Vapor 
Creature — Wall
$0.13 #22164 0.06 32.3 years
Defender (This creature can't attack.)
Prevent all damage that would be dealt to this creature by creatures it's blocking.
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Cards similar to Wall of Vapor 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.
Wall of Shadows96%
$0.16↑#217460.20↑32.3 years
"Prevent all damage that would be dealt to this creature by creatures it's blocking."
+1 more matching line
Armored Transport93%
$0.10↓#222430.0013.6 years↓
"Prevent all combat damage that would be dealt to this creature by creatures blocking it."
Uncle Istvan90%
$0.27↑#240111.00↑32.1 years
"Prevent all damage that would be dealt to this creature by creatures."
Guard Gomazoa90%
$0.27↑#9827↑0.36↑16.4 years↓
"Prevent all combat damage that would be dealt to this creature."
+1 more matching line
Everdawn Champion89%
$0.06↓#248020.86↑8.6 years↓
"Prevent all combat damage that would be dealt to this creature."
Fog Bank89%
$0.14↑#2734↑0.26↑27.9 years↓
"Prevent all combat damage that would be dealt to and dealt by this creature."
+1 more matching line
Seraph of the Sword88%
$0.33↑#179680.18↑13.1 years↓
"Prevent all combat damage that would be dealt to this creature."
Dawn Elemental88%
$0.56↑#251780.57↑23.3 years↓
"Prevent all damage that would be dealt to this creature."
Cho-Manno, Revolutionary88%
$0.44↑#193130.0026.9 years↓
"Prevent all damage that would be dealt to this card."
Benevolent Ancestor86%
$0.04↓#27616↓0.19↑20.9 years↓
"Defender"
Alabaster Wall86%
$0.10↓#263590.0826.9 years↓
"Defender"
Callous Giant86%
$0.23↑#31143↓0.27↑25.9 years↓
"If a source would deal 3 or less damage to this creature, prevent that damage."
Pride Guardian86%
$0.13#17371↑0.0015.1 years↓
"Defender"
Wall of Corpses85%
$0.12↓#251030.33↑29.9 years↓
"Defender"
Psychic Membrane84%
$0.20↑#17329↑0.27↑22.9 years↓
"Defender"
Champion Lancer82%
$3.65↑#30486↓0.32↑27.2 years↓
"Prevent all damage that would be dealt to this creature by creatures."
Wall of Vipers82%
$0.18↑#28923↓0.24↑26.3 years↓
"Defender"
Kaijin of the Vanishing Touch82%
$0.39↑#231110.56↑21.6 years↓
"Defender"
Wall of Tears82%
$0.35↑#12504↑0.43↑28.5 years↓
"Defender"
Vertigo Spawn82%
$0.07↓#265290.53↑20.6 years↓
"Defender"