Cavern Harpy {U}{B}
Creature — Harpy Beast
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 that do something similar 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.
Doomsday Specter 100%
$0.47#22331
"When this creature enters, return a blue or black creature you control to its owner's hand."
+1 more matching line
Marsh Crocodile 100%
$0.22#29225
"When this creature enters, return a blue or black creature you control to its owner's hand."
Silver Drake 91%
$0.21#29553
"When this creature enters, return a white or blue creature you control to its owner's hand."
Sawtooth Loon 91%
$0.08#22606
"When this creature enters, return a white or blue creature you control to its owner's hand."
Razing Snidd 90%
$0.14#31506
"When this creature enters, return a black or red creature you control to its owner's hand."
Lava Zombie 90%
$0.22#29473
"When this creature enters, return a black or red creature you control to its owner's hand."
Fleetfoot Panther 82%
$0.34#14648
"When this creature enters, return a green or white creature you control to its owner's hand."
Steel Leaf Paladin 82%
$0.10#31366
"When this creature enters, return a green or white creature you control to its owner's hand."
Sparkcaster 81%
$0.23#26616
"When this creature enters, return a red or green creature you control to its owner's hand."
Horned Kavu 81%
$0.20#22995
"When this creature enters, return a red or green creature you control to its owner's hand."
Shivan Wurm 81%
#25397
"When this creature enters, return a red or green creature you control to its owner's hand."