Harbinger of the Tides {U}{U}
Creature — Merfolk Wizard
You may cast this spell as though it had flash if you pay {2} more to cast it. (You may cast it any time you could cast an instant.)
When this creature enters, you may return target tapped creature an opponent controls 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.
Riddlemaster Sphinx 96%
$0.17#20383
"When this creature enters, you may return target creature an opponent controls to its owner's hand."
Reflector Mage 90%
$0.46#4787
"When this creature enters, return target creature an opponent controls to its owner's hand. That creature's owner can't cast spells with the same name as that creature until your next turn."
Bigfin Bouncer 90%
$0.20#14159
"When this creature enters, return target creature an opponent controls to its owner's hand."
Stingscourger 90%
$0.04#15564
"When this creature enters, return target creature an opponent controls to its owner's hand."
Academy Journeymage 90%
$0.07#21830
"When this creature enters, return target creature an opponent controls to its owner's hand."
Iceridge Serpent 90%
$0.11#19620
"When this creature enters, return target creature an opponent controls to its owner's hand."
Exclusion Mage 90%
$0.22#15130
"When this creature enters, return target creature an opponent controls to its owner's hand."
Ghitu Amplifier 88%
$0.04#24902
"When this creature enters, if it was kicked, return target creature an opponent controls to its owner's hand."
Moonlit Scavengers 88%
$0.08#27266
"When this creature enters, if you control an artifact or enchantment, return target creature an opponent controls to its owner's hand."
Surrakar Banisher 80%
$0.05#30203
"When this creature enters, you may return target tapped creature to its owner's hand."
Spellweaver Duo 80%
$0.09#30483
"When this creature enters, you may return target tapped creature to its owner's hand."
Breaking Wave 100%
$0.70#21927
"You may cast this spell as though it had flash if you pay {2} more to cast it."
Rout 100%
$0.41#7784
"You may cast this spell as though it had flash if you pay {2} more to cast it."
Saproling Symbiosis 100%
$1.91#5333
"You may cast this spell as though it had flash if you pay {2} more to cast it."
Oakshade Stalker // Moonlit Ambusher 100%
$0.22#22674
"You may cast this spell as though it had flash if you pay {2} more to cast it."
Asinine Antics 100%
$0.83#7715
"You may cast this spell as though it had flash if you pay {2} more to cast it."
Mystical Tether 100%
$0.12#19396
"You may cast this spell as though it had flash if you pay {2} more to cast it."
Ghitu Fire 100%
$0.37#22230
"You may cast this spell as though it had flash if you pay {2} more to cast it."
Twilight's Call 100%
$0.71#13913
"You may cast this spell as though it had flash if you pay {2} more to cast it."