Keiga, the Tide Star 
Legendary Creature — Dragon Spirit
$0.36 #4440 0.61 22.1 years
Flying
When Keiga dies, gain control of target creature.
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Cards similar to Keiga, the Tide Star 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.
Entrancing Melody85%
$0.21↓#11243↓0.38↓9.1 years↓
"Gain control of target creature with mana value X."
Sower of Temptation84%
$2.66↑#41080.5819.0 years↓
"When this creature enters, gain control of target creature for as long as this creature remains on the battlefield."
Dominate84%
$0.49↑#17247↓0.43↓26.7 years↑
"Gain control of target creature with mana value X or less."
Screeching Buzzard80%
$0.04↓#27326↓0.11↓24.0 years↑
"Flying"
Lullmage's Domination80%
$0.08↓#20184↓0.29↓6.1 years↓
"Gain control of target creature with mana value X."
Lorcan, Warlock Collector79%
$0.50↑#12302↓0.21↓5.2 years↓
"Flying"
Thieving Skydiver79%
$0.26↓#2391↑0.43↓6.1 years↓
"Flying"
Switcheroo75%
$0.14↓#14410↓0.24↓14.3 years↓
"Exchange control of two target creatures."
Aura Thief74%
$8.19↑#11218↓0.85↑27.4 years↑
"When this creature dies, you gain control of all enchantments."
+1 more matching line
Mind Flayer74%
$0.40↑#46410.605.2 years↓
"When this creature enters, gain control of target creature for as long as you control this creature."
Fighting Drake74%
$0.10↓#32007↓0.00↓29.0 years↑
"Flying"
Vassal Soul74%
$0.08↓#30769↓0.00↓14.0 years↓
"Flying"
Air Elemental74%
$0.02↓#24432↓0.27↓33.2 years↑
"Flying"
Mahamoti Djinn74%
$0.09↓#25646↓0.00↓33.2 years↑
"Flying"
Bog Imp74%
$0.06↓#27311↓0.06↓32.2 years↑
"Flying"
Cloud Manta74%
$0.02↓#27920↓0.00↓11.0 years↓
"Flying"
Spotted Griffin74%
$0.17↓#29989↓0.00↓29.5 years↑
"Flying"
Territorial Roc74%
$0.02↓#28691↓0.00↓11.6 years↓
"Flying"
Leonin Skyhunter74%
$0.18↓#16316↓0.19↓23.0 years
"Flying"
Anvilwrought Raptor74%
$0.03↓#21744↓0.00↓13.1 years↓
"Flying"