Riptide Entrancer {1}{U}{U}
Creature — Human Wizard
Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, gain control of target creature that player controls. (This effect lasts indefinitely.)
Morph {U}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
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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.
Demon of Loathing 86%
$0.46#8186
"Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice."
Cabal Executioner 86%
$0.21#25603
"Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice."
+1 more matching line
Cacophony Scamp 86%
$0.28#11681
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, proliferate."
Aspiring Champion 84%
$0.45#9774
"When this creature deals combat damage to a player, sacrifice it. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield, then shuffle the rest into your library. If that creature is a Demon, it deals damage equal to its power to each opponent."
Haunted Cadaver 84%
$0.12#27339
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, that player discards three cards."
+1 more matching line
Thalakos Deceiver 84%
$3.12#16488
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, gain control of target creature."
Mordant Dragon 84%
$0.38#12385
"Whenever this creature deals combat damage to a player, you may have it deal that much damage to target creature that player controls."