Cavern Harpy 
Creature — Harpy Beast
$0.26 #16797 0.33 25.7 years
Flying
When this creature enters, return a blue or black creature you control to its owner's hand.
Pay 1 life: Return this creature to its owner's hand.
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Cards similar to Cavern Harpy 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.
Marsh Crocodile94%
$0.23↓#29823↓0.2825.7 years
"When this creature enters, return a blue or black creature you control to its owner's hand."
Silver Drake87%
$0.14↓#30253↓0.2726.8 years↑
"When this creature enters, return a white or blue creature you control to its owner's hand."
Doomsday Specter86%
$0.36↑#23192↓0.12↓25.7 years
"When this creature enters, return a blue or black creature you control to its owner's hand."
+1 more matching line
Lava Zombie85%
$0.20↓#30172↓0.05↓25.7 years
"When this creature enters, return a black or red creature you control to its owner's hand."
Skull Collector80%
$0.29↑#20968↓0.06↓21.4 years↓
"At the beginning of your upkeep, return a black creature you control to its owner's hand."
Razing Snidd80%
$0.11↓#32137↓0.18↓25.7 years
"When this creature enters, return a black or red creature you control to its owner's hand."
Loyal Gryff80%
$0.17↓#21864↓0.265.1 years↓
"When this creature enters, you may return another creature you control to its owner's hand."
Yarok's Wavecrasher80%
$0.13↓#28212↓0.12↓7.3 years↓
"When this creature enters, return another creature you control to its owner's hand."
Ambush Krotiq80%
$0.03↓#25454↓0.06↓11.7 years↓
"When this creature enters, return another creature you control to its owner's hand."
Sawtooth Loon79%
$0.09↓#23220↓0.00↓25.7 years
"When this creature enters, return a white or blue creature you control to its owner's hand."
Trusted Advisor77%
$0.28↑#21079↓0.04↓21.4 years↓
"At the beginning of your upkeep, return a blue creature you control to its owner's hand."
Shrieking Drake76%
$0.16↓#4664↑0.62↑29.7 years↑
"When this creature enters, return a creature you control to its owner's hand."
Dust Elemental76%
$0.40↑#21130↓0.00↓19.7 years↓
"When this creature enters, return three creatures you control to their owner's hand."
Deputy of Acquittals76%
$0.05↓#178120.07↓13.5 years↓
"When this creature enters, you may return another target creature you control to its owner's hand."
Wydwen, the Biting Gale76%
$0.36↑#180620.00↓19.0 years↓
", Pay 1 life: Return this card to its owner's hand."
, Pay 1 life: Return this card to its owner's hand."
Stonecloaker75%
$0.12↓#136240.13↓19.7 years↓
"When this creature enters, return a creature you control to its owner's hand."
Denizen of the Deep75%
$0.16↓#22569↓0.14↓28.3 years↑
"When this creature enters, return each other creature you control to its owner's hand."
Storm Sculptor74%
$0.07↓#24355↓0.289.1 years↓
"When this creature enters, return a creature you control to its owner's hand."
Keymaster Rogue74%
$0.04↓#24302↓0.19↓13.7 years↓
"When this creature enters, return a creature you control to its owner's hand."
Quickling74%
$0.36↑#7755↑0.00↓12.3 years↓
"When this creature enters, sacrifice it unless you return another creature you control to its owner's hand."
+1 more matching line