Riddlemaster Sphinx 
Creature — Sphinx
$0.21 #20730 0.14 8.1 years
Flying (This creature can't be blocked except by creatures with flying or reach.)
When this creature enters, you may return target creature an opponent controls to its owner's hand.
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Cards similar to Riddlemaster Sphinx 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.
Bigfin Bouncer100%
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"When this creature enters, return target creature an opponent controls to its owner's hand."
Exclusion Mage100%
$0.06↓#15333↑0.198.1 years
"When this creature enters, return target creature an opponent controls to its owner's hand."
Iceridge Serpent100%
$0.09↓#197540.211.4 years↓
"When this creature enters, return target creature an opponent controls to its owner's hand."
Angler Drake99%
$0.04↓#246111.14↑9.4 years↑
"When this creature enters, you may return target creature to its owner's hand."
Sun Ce, Young Conquerer99%
$109.99↑#25171↓0.59↑27.3 years↑
"When this card enters, you may return target creature to its owner's hand."
Mist Raven99%
$0.06↓#16186↑0.00↓14.3 years↑
"When this creature enters, return target creature to its owner's hand."
Separatist Voidmage98%
$0.19↓#25609↓0.1411.1 years↑
"When this creature enters, you may return target creature to its owner's hand."
Voidwielder98%
$0.10↓#28860↓0.25↑13.9 years↑
"When this creature enters, you may return target creature to its owner's hand."
Man-o'-War98%
$0.08↓#8082↑0.45↑29.6 years↑
"When this creature enters, return target creature to its owner's hand."
Aether Adept98%
$0.09↓#12713↑0.32↑16.1 years↑
"When this creature enters, return target creature to its owner's hand."
Air-Cult Elemental98%
$0.08↓#240140.00↓5.1 years↓
"When this creature enters, return up to one other target creature to its owner's hand."
Rimekin Recluse98%
$0.21#192400.00↓0.6 years↓
"When this creature enters, return up to one other target creature to its owner's hand."
Academy Journeymage94%
$0.05↓#217150.71↑8.4 years
"When this creature enters, return target creature an opponent controls to its owner's hand."
Hoverguard Sweepers94%
$0.25↑#236060.00↓22.3 years↑
"When this creature enters, you may return up to two target creatures to their owners' hands."
Cunning Geysermage94%
$0.02↓#26651↓0.00↓5.9 years↓
"When this creature enters, if it was kicked, return up to one other target creature to its owner's hand."
Hotshot Investigators92%
$0.07↓#25739↓0.242.6 years↓
"When this creature enters, return up to one other target creature to its owner's hand. If you controlled it, investigate."
Aven Surveyor91%
$0.09↓#230850.1911.6 years↑
"• Return target creature to its owner's hand."
Winter Eladrin90%
$0.18↓#15655↑0.00↓4.2 years↓
"When this creature enters, return up to one other target creature to its owner's hand."
Spider-Man 2099, Miguel O'Hara90%
$7.86↑#11478↑0.48↑0.9 years↓
"When this card enters, return up to one target creature to its owner's hand."
Reflector Mage90%
$0.38↑#4819↑0.34↑10.6 years↑
"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."