Marsh Crocodile {2}{U}{B}
Creature — Crocodile
When this creature enters, return a blue or black creature you control to its owner's hand.
When this creature enters, each player discards a card.
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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.
Cavern Harpy 100%
$0.28#16155
"When this creature enters, return a blue or black creature you control to its owner's hand."
Doomsday Specter 100%
$0.47#22331
"When this creature enters, return a blue or black creature you control to its owner's hand."
Fanatic of the Harrowing 99%
$0.20#14198
"When this creature enters, each player discards a card. If you discarded a card this way, draw a card."
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."
Refurbished Familiar 83%
$0.26#7178
"When this creature enters, each opponent discards a card. For each opponent who can't, you draw a card."
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."