Stoic Ephemera 
Creature — Spirit
$0.12 #27806 0.22 20.3 years
Defender (This creature can't attack.)
Flying
When this creature blocks, sacrifice it at end of combat.
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Cards similar to Stoic Ephemera 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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"When this creature attacks or blocks, sacrifice it at end of combat."
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"When this creature attacks or blocks, sacrifice it at end of combat."
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"When this creature attacks or blocks, destroy it at end of combat."
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"Defender"
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$0.13↑#17371↑0.00↓15.1 years↓
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"When this creature blocks, destroy it at end of combat."
+1 more matching line
Psychic Membrane86%
$0.20↑#17329↑0.2722.9 years↑
"Defender"
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$0.15↑#317360.2926.3 years↑
"When this creature attacks or blocks, return it to its owner's hand at end of combat."
Arrogant Bloodlord86%
$0.09↓#286330.2216.4 years↓
"Whenever this creature blocks or becomes blocked by a creature with power 1 or less, destroy this creature at end of combat."
Clockwork Condor86%
$0.06↓#264150.50↑22.9 years↑
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
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$0.10↓#312390.00↓24.9 years↑
"When this creature attacks or blocks, return it to its owner's hand at end of combat."
Clockwork Beetle85%
$0.11↓#19968↑0.00↓22.9 years↑
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Flailing Drake85%
$0.16↑#319820.2428.9 years↑
"Whenever this creature blocks or becomes blocked by a creature, that creature gets +1/+1 until end of turn."
Blistering Barrier85%
$0.12#282290.36↑29.9 years↑
"Defender"
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"Defender"
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"Defender"