Celestial Regulator 
Creature — Angel Advisor
$0.16 #21942 0.14 4.4 years
Flying
When this creature enters, choose target creature you don't control and tap it. If you control a creature with a counter on it, the chosen creature doesn't untap during its controller's next untap step.
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Cards similar to Celestial Regulator 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.
Fear of Immobility94%
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"When this creature enters, tap up to one target creature. If an opponent controls that creature, put a stun counter on it."
Fractal Mascot94%
$0.13↓#225950.00↓0.4 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Rowdy Snowballers94%
$0.17↑#13993↑0.00↓0.8 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol94%
$0.17↑#30233↓0.00↓0.2 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Alchemax Slayer-Bots94%
$0.22↑#181290.170.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Utrom Scientists93%
$0.13↓#221620.00↓0.5 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Stitched Mangler93%
$0.11↓#210620.1810.4 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Kor Hookmaster93%
$0.05↓#256060.1316.9 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Frost Trickster93%
$0.10↓#175710.115.4 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Watertrap Weaver93%
$0.06↓#222060.53↑8.9 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Spire Patrol93%
$0.21↑#28315↓0.189.6 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Frost Lynx93%
$0.04↓#197630.41↑12.1 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Chillbringer92%
$0.05↓#260130.067.6 years↑
"When this creature enters, tap target creature an opponent controls. It doesn't untap during its controller's next untap step."
Gilded Scuttler91%
$0.26↑#14055↑0.151.8 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Donatello, Rad Scientist91%
$0.38↑#189600.00↓0.5 years↓
"When this card enters, tap up to three target creatures your opponents control. Put a stun counter on each of them."
White Dragon90%
$0.15↓#16285↑0.065.1 years
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Collector's Case90%
$0.16#27215↓0.00↓0.2 years↓
"When this artifact enters, tap up to one target creature and put two stun counters on it."
Constrictor Sage89%
$0.15↓#214750.221.4 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Sharktocrab89%
$0.17↑#14586↑0.36↑7.6 years↑
"Whenever one or more +1/+1 counters are put on this creature, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Tranquilize89%
$0.17↑#13061↑0.57↑2.2 years↓
"Tap target creature an opponent controls and put three stun counters on it."