Dream Strix 
Creature — Bird Illusion
$0.10 #25179 0.41 5.5 years
Flying
When this creature becomes the target of a spell, sacrifice it.
When this creature dies, learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)
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Cards similar to Dream Strix 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.
Eyetwitch97%
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"When this creature dies, learn."
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"When this creature becomes the target of a spell or ability, sacrifice it."
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"When this creature becomes the target of a spell or ability, sacrifice it."
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Phantasmal Dragon90%
$0.25↑#19466↑0.00↓15.3 years↑
"When this creature becomes the target of a spell or ability, sacrifice it."
+1 more matching line
Gossamer Phantasm90%
$0.06↓#297890.00↓19.7 years↑
"When this creature becomes the target of a spell or ability, sacrifice it."
Skulking Ghost90%
$0.11↑#30839↓0.00↓30.0 years↑
"When this creature becomes the target of a spell or ability, sacrifice it."
Legion Angel90%
$0.30↑#258370.05↓6.1 years
"Flying"
Skulking Fugitive90%
$0.11↑#31861↓0.00↓27.0 years↑
"When this creature becomes the target of a spell or ability, sacrifice it."
Phantasmal Bear90%
$0.10#226780.10↓15.3 years↑
"When this creature becomes the target of a spell or ability, sacrifice it."
Phantom Beast90%
$0.09↓#30492↓0.00↓16.3 years↑
"When this creature becomes the target of a spell or ability, sacrifice it."
Tar Pit Warrior90%
$0.09↓#32175↓0.16↓29.7 years↑
"When this creature becomes the target of a spell or ability, sacrifice it."
Frost Walker90%
$0.06↓#275230.19↓11.8 years↑
"When this creature becomes the target of a spell or ability, sacrifice it."
Phantasmal Abomination90%
$0.15↑#258960.25↓16.5 years↑
"When this creature becomes the target of a spell or ability, sacrifice it."
Phantasmal Dreadmaw84%
$0.09↓#17343↑0.06↓5.3 years
"When this creature becomes the target of a spell or ability, sacrifice it."
Skulking Knight84%
$0.08↓#30833↓0.18↓20.0 years↑
"When this creature becomes the target of a spell or ability, sacrifice it."
Labyrinth Guardian82%
$0.08↓#288320.00↓9.5 years↑
"When this creature becomes the target of a spell, sacrifice it."
Cram Session81%
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"Learn."
Guiding Voice80%
$0.17↑#240050.00↓5.5 years
"Learn."
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$0.17↑#9542↑0.00↓8.3 years↑
"When this creature becomes the target of a spell, sacrifice it."
Pop Quiz80%
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"Learn."