Stoic Ephemera 
Creature — Spirit
$0.10 #28010 0.00 20.5 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.
Fog Elemental95%
$0.09↓#295540.0529.4 years↑
"When this creature attacks or blocks, sacrifice it at end of combat."
Mardu Blazebringer94%
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"When this creature attacks or blocks, sacrifice it at end of combat."
Ceremonial Guard90%
$0.04↓#321910.0027.0 years↑
"When this creature attacks or blocks, destroy it at end of combat."
Runaway Carriage89%
$0.06↓#285740.0010.5 years↓
"When this creature attacks or blocks, sacrifice it at end of combat."
Vebulid88%
$0.73↑#264830.0628.0 years↑
"When this creature attacks or blocks, destroy it at end of combat."
Angelic Wall88%
$0.17↑#8810↑0.0028.3 years↑
"Defender"
Pride Guardian88%
$0.12↑#17422↑0.0515.3 years↓
"Defender"
Wall of Swords88%
$0.18↑#20570↑0.0633.2 years↑
"Defender"
Cinder Wall87%
$0.07↓#267150.0029.4 years↑
"When this creature blocks, destroy it at end of combat."
+1 more matching line
Psychic Membrane86%
$0.21↑#17465↑0.0623.0 years↑
"Defender"
Windscouter86%
$0.15↑#320090.0626.4 years↑
"When this creature attacks or blocks, return it to its owner's hand at end of combat."
Clockwork Condor86%
$0.06↓#267130.0023.0 years↑
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Arrogant Bloodlord86%
$0.09↓#290190.0016.5 years↓
"Whenever this creature blocks or becomes blocked by a creature with power 1 or less, destroy this creature at end of combat."
Phantom Whelp85%
$0.09↓#315380.0025.1 years↑
"When this creature attacks or blocks, return it to its owner's hand at end of combat."
Clockwork Beetle85%
$0.13↑#20244↑0.0523.0 years↑
"Whenever this creature attacks or blocks, remove a +1/+1 counter from it at end of combat."
Flailing Drake85%
$0.14↑#322740.0029.0 years↑
"Whenever this creature blocks or becomes blocked by a creature, that creature gets +1/+1 until end of turn."
Wall of Razors85%
$0.31↑#21851↑0.18↑28.6 years↑
"Defender"
Wall of Ice85%
$0.31↑#17299↑0.0633.2 years↑
"Defender"
Moat Piranhas85%
$0.16↑#253470.007.3 years↓
"Defender"
Carnivorous Plant85%
$0.10#286330.0032.2 years↑
"Defender"