Mind Flayer 
Creature — Horror
$0.35 #4550 0.65 5.1 years
Dominate Monster — When this creature enters, gain control of target creature for as long as you control this creature.
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Cards similar to Mind Flayer 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.
Sower of Temptation90%
$2.59↑#40300.52↓18.9 years↑
"When this creature enters, gain control of target creature for as long as this creature remains on the battlefield."
Rubinia Soulsinger78%
$0.38↑#19060↓0.48↓32.3 years↑
"
: Gain control of target creature for as long as you control this card and this card remains tapped."
: Gain control of target creature for as long as you control this card and this card remains tapped."
Dragonlord Silumgar76%
$4.18↑#6717↓0.51↓11.4 years↑
"When this card enters, gain control of target creature or planeswalker for as long as you control this card."
Black Dragon76%
$0.26↓#15550↓0.14↓5.1 years
"When this creature enters, target creature an opponent controls gets -3/-3 until end of turn."
Entrancing Melody74%
$0.24↓#11399↓0.698.9 years↑
"Gain control of target creature with mana value X."
Ritual of the Machine74%
$9.02↑#18193↓0.53↓30.2 years↑
"Gain control of target nonartifact, nonblack creature."
Keiga, the Tide Star74%
$0.30↓#43620.47↓21.9 years↑
"When this card dies, gain control of target creature."
Soul Seizer // Ghastly Haunting74%
$0.12↓#24083↓0.00↓14.6 years↑
"When this creature deals combat damage to a player, you may transform it. If you do, attach it to target creature that player controls."
Gilded Drake73%
$208.84↑#2659↑1.48↑27.9 years↑
"When this creature enters, exchange control of this creature and up to one target creature an opponent controls. If you don't or can't make an exchange, sacrifice this creature. This ability still resolves if its target becomes illegal."
Shield Broker73%
$0.19↓#10450↓0.40↓4.4 years
"When this creature enters, put a shield counter on target noncommander creature you don't control. You gain control of that creature for as long as it has a shield counter on it."
Roil Elemental72%
$13.26↑#39391.06↑16.9 years↑
"Whenever a land you control enters, you may gain control of target creature for as long as you control this creature."
Dragon Turtle72%
$0.32↓#11469↓0.27↓5.1 years
"When this creature enters, tap it and up to one target creature an opponent controls. They don't untap during their controllers' next untap steps."
Evangelize72%
$0.33↓#24660↓0.14↓19.9 years↑
"Gain control of target creature of an opponent's choice they control."
Kitsune, Dragon's Daughter72%
$0.29↓#17332↓0.00↓0.5 years↓
"Whenever this card enters or deals combat damage to a player, you may exchange control of two other target creatures controlled by different players."
Possession Engine72%
$0.25↓#10173↓0.30↓1.6 years↓
"When this Vehicle enters, gain control of target creature an opponent controls for as long as you control this Vehicle. That creature can't attack or block for as long as you control this Vehicle."
Siren of the Fanged Coast72%
$0.24↓#25908↓0.25↓12.6 years↑
"When this creature enters, if tribute wasn't paid, gain control of target creature."
Dominate72%
$0.46↑#17007↓0.88↑26.6 years↑
"Gain control of target creature with mana value X or less."
Willbreaker72%
$1.78↑#6322↓0.92↑11.1 years↑
"Whenever a creature an opponent controls becomes the target of a spell or ability you control, gain control of that creature for as long as you control this creature."
White Dragon72%
$0.15↓#16285↓0.06↓5.1 years
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Riptide Entrancer71%
$1.41↑#18036↓0.31↓23.9 years↑
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, gain control of target creature that player controls."