Psychic Membrane 
Creature — Wall
$0.20 #17329 0.27 22.9 years
Defender (This creature can't attack.)
Whenever this creature blocks, you may draw a card.
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Cards similar to Psychic Membrane 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 Dust94%
$0.21↑#25736↓0.00↓32.3 years↑
"Defender"
Chambered Nautilus92%
$0.17↓#27255↓0.07↓26.9 years↑
"Whenever this creature becomes blocked, you may draw a card."
Drelnoch90%
$0.10↓#27766↓0.00↓20.1 years↓
"Whenever this creature becomes blocked, you may draw two cards."
Vertigo Spawn90%
$0.07↓#26529↓0.53↑20.6 years↓
"Defender"
Mindbender Spores88%
$1.38↑#21945↓0.53↑29.9 years↑
"Defender"
Howling Golem86%
$0.17↓#6491↑0.268.4 years↓
"Whenever this creature attacks or blocks, each player draws a card."
Stoic Ephemera86%
$0.12↓#27806↓0.2220.3 years↓
"Defender"
Saprazzan Heir86%
$1.98↑#21450↓0.00↓26.9 years↑
"Whenever this creature becomes blocked, you may draw three cards."
Pride Guardian86%
$0.13↓#173710.00↓15.1 years↓
"Whenever this creature blocks, you gain 3 life."
+1 more matching line
Wall of Corpses85%
$0.12↓#25103↓0.3329.9 years↑
"Defender"
Slith Strider84%
$0.09↓#27979↓0.50↑22.9 years
"Whenever this creature becomes blocked, draw a card."
Ageless Sentinels84%
$0.29↑#26604↓0.40↑23.3 years
"Defender"
Foriysian Interceptor84%
$0.15↓#25277↓0.11↓19.9 years↓
"Defender"
Infiltration Lens84%
$2.09↑#3730↑0.17↓15.9 years↓
"Whenever equipped creature becomes blocked by a creature, you may draw two cards."
Goldenglow Moth84%
$0.08↓#188260.2718.3 years↓
"Whenever this creature blocks, you may gain 4 life."
Wall of Vapor84%
$0.13↓#22164↓0.06↓32.3 years↑
"Defender"
Four Knocks83%
$0.77↑#8802↑0.67↑2.9 years↓
"At the beginning of your first main phase, draw a card."
Wall of Vipers82%
$0.18↓#28923↓0.2426.3 years↑
"Defender"
Wall of Glare82%
$0.37↑#8164↑0.06↓27.2 years↑
"Defender"
Wall of Caltrops82%
$0.73↑#26463↓0.2132.3 years↑
"Defender"