Somnophore 
Creature — Illusion
$0.46 #25922 0.11 27.9 years
Flying
Whenever this creature deals damage to a player, tap target creature that player controls. That creature doesn't untap during its controller's untap step for as long as this creature remains on the battlefield.
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Cards similar to Somnophore 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.
Thalakos Dreamsower96%
$0.24↓#260530.32↑28.9 years
"Whenever this creature deals damage to an opponent, tap target creature. That creature doesn't untap during its controller's untap step for as long as this creature remains tapped."
Neko-Te92%
$5.32↑#19108↑0.24↑21.6 years↓
"Whenever equipped creature deals damage to a creature, tap that creature. That creature doesn't untap during its controller's untap step for as long as this Equipment remains on the battlefield."
Dungeon Geists86%
$0.12↓#18025↑0.2114.6 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control this creature."
Sand Squid86%
$0.57↑#258100.41↑26.9 years
"
: Tap target creature. That creature doesn't untap during its controller's untap step for as long as this creature remains tapped."
: Tap target creature. That creature doesn't untap during its controller's untap step for as long as this creature remains tapped."
Deserter's Quarters84%
$0.14↓#294800.1412.3 years↓
"
, : Tap target creature. It doesn't untap during its controller's untap step for as long as this artifact remains tapped."
, : Tap target creature. It doesn't untap during its controller's untap step for as long as this artifact remains tapped."
Matsu-Tribe Sniper81%
$0.11↓#17917↑0.61↑21.6 years↓
"Whenever this creature deals damage to a creature, tap that creature and it doesn't untap during its controller's next untap step."
Ty Lee, Chi Blocker80%
$0.47↑#6825↑0.00↓0.8 years↓
"When this card enters, tap up to one target creature. It doesn't untap during its controller's untap step for as long as you control this card."
Entrancing Lyre79%
$0.10↓#231870.126.6 years↓
"
, : Tap target creature with power X or less. It doesn't untap during its controller's untap step for as long as this artifact remains tapped."
, : Tap target creature with power X or less. It doesn't untap during its controller's untap step for as long as this artifact remains tapped."
Kitesail Cleric79%
$0.12↓#216310.045.9 years↓
"Flying"
Warrior Angel79%
$0.61↑#292660.27↑28.5 years
"Flying"
Francisco, Fowl Marauder78%
$0.25↓#6865↑0.072.8 years↓
"Flying"
Icefall Regent78%
$0.47↑#12998↑0.65↑11.4 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control this creature."
Malcolm, Keen-Eyed Navigator77%
$0.26↓#3113↑0.47↑5.8 years↓
"Flying"
Sigil of Sleep76%
$4.88↑#3420↑0.59↑27.2 years
"Whenever enchanted creature deals damage to a player, return target creature that player controls to its owner's hand."
Mana Skimmer75%
$0.10↓#298850.43↑19.9 years↓
"Whenever this creature deals damage to a player, tap target land that player controls. That land doesn't untap during its controller's next untap step."
Harrier Griffin74%
$0.12↓#254340.33↑20.6 years↓
"At the beginning of your upkeep, tap target creature."
Shivan Hellkite74%
$0.26↓#19460↑0.29↑27.9 years
"Flying"
Velvetwing Butterflies // Gaze in Wonder74%
$0.14↓#264580.00↓0.1 years↓
"Flying"
Niblis of the Breath74%
$0.28↓#17509↑0.40↑14.6 years↓
"Flying"
Sentinel of the Eternal Watch74%
$0.12↓#16982↑0.0611.1 years↓
"At the beginning of combat on each opponent's turn, tap target creature that player controls."