Hammerhead Tyrant 
Creature — Dragon
$0.32 #4908 0.43 1.4 years
Flying
Whenever you cast a spell, return up to one target nonland permanent an opponent controls with mana value less than or equal to that spell's mana value to its owner's hand.
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Cards similar to Hammerhead Tyrant 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.
Brinelin, the Moon Kraken90%
$0.24↓#54200.30↓5.8 years↑
"When this card enters and whenever you cast a spell with mana value 6 or greater, you may return target nonland permanent to its owner's hand."
Hoard-Smelter Dragon83%
$0.17↓#9544↓0.06↓15.9 years↑
"Flying"
Displacement Wave82%
$0.58↑#12060↓0.4411.1 years↑
"Return all nonland permanents with mana value X or less to their owners' hands."
Soratami Mirror-Mage82%
$0.20↓#17364↓0.00↓21.9 years↑
"Flying"
Equilibrium82%
$0.43↑#11309↓0.88↑28.2 years↑
"Whenever you cast a creature spell, you may pay 
. If you do, return target creature to its owner's hand."
. If you do, return target creature to its owner's hand."
Mists of Lórien81%
$0.87↑#8670↓0.28↓2.8 years↑
"Return target nonland permanent and each other nonland permanent with the same mana value as that permanent to their owners' hands."
Serum Snare81%
$0.35↑#45410.08↓3.6 years↑
"Return target nonland permanent to its owner's hand. If that permanent had mana value 3 or less, proliferate."
Void Squall81%
$0.11↓#28013↓0.3511.4 years↑
"Return target nonland permanent to its owner's hand."
Aerial Extortionist80%
$4.61↑#2743↑0.394.4 years↑
"Flying"
Repeal80%
$0.09↓#12153↓0.07↓20.6 years↑
"Return target nonland permanent with mana value X to its owner's hand."
Wan Shi Tong, All-Knowing80%
$0.90↑#14380↓0.00↓0.8 years
"Flying"
You Come to a River80%
$0.23↓#8066↓0.335.1 years↑
"• Fight the Current — Return target nonland permanent to its owner's hand."
Depart the Realm80%
$0.29↓#9882↓0.59↑5.6 years↑
"Return target nonland permanent to its owner's hand."
Eject79%
$0.22↓#11324↓0.26↓1.2 years
"Return target nonland permanent to its owner's hand."
Machine Over Matter79%
$0.16↓#14939↓0.74↑3.8 years↑
"Return target nonland permanent to its owner's hand."
Hullbreaker Horror78%
$5.32↑#274↑1.74↑4.8 years↑
"• Return target nonland permanent to its owner's hand."
Spellbound Dragon78%
$0.34↑#20768↓0.61↑17.3 years↑
"Flying"
Gust of Wind78%
$0.17↓#14394↓0.21↓6.4 years↑
"Return target nonland permanent you don't control to its owner's hand."
Echoing Truth78%
$0.17↓#9783↓0.4222.6 years↑
"Return target nonland permanent and all other permanents with the same name as that permanent to their owners' hands."
Run Ashore78%
$0.09↓#25449↓0.13↓5.6 years↑
"• Return target nonland permanent to its owner's hand."