Pouncing Shoreshark 

Creature — Shark Beast
$0.21 #7079 0.19 6.5 years
Mutate 
(If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Flash
Whenever this creature mutates, you may return target creature an opponent controls to its owner's hand.
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Cards similar to Pouncing Shoreshark 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.
Equilibrium88%
$0.43↑#11477↓0.98↑28.3 years↑
"Whenever you cast a creature spell, you may pay
. If you do, return target creature to its owner's hand."
Porcuparrot88%
$0.24↑#13933↓0.226.5 years
"Mutate 
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
Lady Sun86%
$104.99↑#27178↓0.1427.5 years↑
"
: Return this card and another target creature to their owners' hands. Activate only during your turn, before attackers are declared."
Drown in Shapelessness86%
$0.20↓#26942↓0.74↑8.3 years↑
"Return target creature to its owner's hand."
Coastal Wizard86%
$2.99↑#31127↓0.00↓28.3 years↑
"
: Return this creature and another target creature to their owners' hands. Activate only during your turn, before attackers are declared."
Echo Tracer85%
$0.07↓#16769↓0.00↓23.7 years↑
"When this creature is turned face up, return target creature to its owner's hand."
+1 more matching line
Gemrazer82%
$0.42↑#3954↑0.266.5 years
"Mutate 

If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
Mistblade Shinobi82%
$0.69↑#3322↑0.2621.7 years↑
"Whenever this creature deals combat damage to a player, you may return target creature that player controls to its owner's hand."
Huntmaster Liger81%
$0.17↓#13733↓0.05↓6.5 years
"Mutate 
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
Icefeather Aven80%
$0.24↑#12729↓0.40↑12.1 years↑
"When this creature is turned face up, you may return another target creature to its owner's hand."
+1 more matching line
Skymark Roc80%
$0.12↓#23732↓0.06↓14.0 years↑
"Whenever this creature attacks, you may return target creature defending player controls with toughness 2 or less to its owner's hand."