Dungeon Geists 
Creature — Spirit
$0.12 #18025 0.21 14.6 years
Flying
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.
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Cards similar to Dungeon Geists 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.
Ty Lee, Chi Blocker96%
$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."
Icefall Regent95%
$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."
Sand Squid91%
$0.57↑#25810↓0.41↑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."
Niblis of the Mist88%
$0.18↑#28236↓0.33↑14.6 years
"When this creature enters, you may tap target creature."
Deserter's Quarters88%
$0.14↑#29480↓0.1412.3 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."
Chrome Prowler86%
$0.17↑#197480.123.6 years↓
"When this creature enters, tap target creature an opponent controls."
Heavy Infantry86%
$0.01↓#30138↓0.2911.1 years↓
"When this creature enters, tap target creature an opponent controls."
Spider-Woman, Secret Agent86%
$0.14↑#204740.00↓0.2 years↓
"When this card enters, tap target creature an opponent controls. That creature can't become untapped for as long as you control this card."
Thalakos Dreamsower86%
$0.24↑#26053↓0.32↑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."
Somnophore86%
$0.46↑#25922↓0.1127.9 years↑
"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."
+1 more matching line
Leonin Snarecaster86%
$0.05↓#24501↓0.06↓12.9 years↓
"When this creature enters, you may tap target creature."
Somnomancer86%
$0.13↑#30581↓0.00↓18.3 years↑
"When this creature enters, you may tap target creature."
Tidebinder Mage86%
$0.20↑#214530.71↑13.1 years↓
"When this creature enters, tap target red or green creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control this creature."
Glaring Aegis86%
$0.07↓#177390.00↓11.4 years↓
"When this Aura enters, tap target creature an opponent controls."
Starlight Snare86%
$0.13↑#204130.251.8 years↓
"When this Aura enters, tap enchanted creature."
Charmed Sleep86%
$0.07↓#155620.256.9 years↓
"When this Aura enters, tap enchanted creature."
Claustrophobia86%
$0.05↓#190770.36↑14.9 years
"When this Aura enters, tap enchanted creature."
Sleep Paralysis86%
$0.06↓#23005↓0.88↑10.4 years↓
"When this Aura enters, tap enchanted creature."
Paralyze86%
$0.13↑#205250.57↑33.1 years↑
"When this Aura enters, tap enchanted creature."
Capture Sphere86%
$0.05↓#187020.257.9 years↓
"When this Aura enters, tap enchanted creature."