Celestial Regulator 
Creature — Angel Advisor
$0.12 #22266 0.00 4.5 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%
$0.13↑#17654↑0.25↑2.1 years↓
"When this creature enters, tap up to one target creature. If an opponent controls that creature, put a stun counter on it."
Fractal Mascot94%
$0.09↓#222540.090.5 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Rowdy Snowballers94%
$0.10↓#13824↑0.17↑0.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Alchemax Slayer-Bots94%
$0.19↑#180340.43↑1.1 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol94%
$0.21↑#29666↓0.16↑0.3 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Utrom Scientists93%
$0.06↓#219010.31↑0.6 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Spire Patrol93%
$0.05↓#28618↓0.049.7 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Stitched Mangler93%
$0.13↑#213360.31↑10.5 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%
$0.08↓#224630.39↑9.1 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↓#258850.0617.0 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↓#200630.27↑12.3 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↓#178620.25↑5.5 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Chillbringer92%
$0.06↓#262680.067.7 years↑
"When this creature enters, tap target creature an opponent controls. It doesn't untap during its controller's next untap step."
Gilded Scuttler91%
$0.34↑#13567↑0.061.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Donatello, Rad Scientist91%
$0.35↑#187000.45↑0.6 years↓
"When this card enters, tap up to three target creatures your opponents control. Put a stun counter on each of them."
White Dragon90%
$0.21↑#16599↑0.11↑5.2 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%
$0.25↑#260130.30↑0.3 years↓
"When this artifact enters, tap up to one target creature and put two stun counters on it."
Constrictor Sage89%
$0.11↓#215290.061.5 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Sharktocrab89%
$0.20↑#14774↑0.19↑7.7 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%
$0.14↑#13245↑0.26↑2.3 years↓
"Tap target creature an opponent controls and put three stun counters on it."