Frost Trickster 
Creature — Bird Wizard
$0.10 #17862 0.25 5.5 years
Flying
When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.
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Cards similar to Frost Trickster 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.
Spire Patrol100%
$0.05↓#28618↓0.04↓9.7 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Chillbringer100%
$0.06↓#26268↓0.06↓7.7 years↑
"When this creature enters, tap target creature an opponent controls. It doesn't untap during its controller's next untap step."
Frost Lynx100%
$0.04↓#200630.2712.3 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Stitched Mangler100%
$0.13↑#213360.3110.5 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Watertrap Weaver100%
$0.08↓#22463↓0.39↑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 Hookmaster100%
$0.05↓#25885↓0.06↓17.0 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
White Dragon96%
$0.21↑#165990.11↓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."
Fractal Mascot96%
$0.09↓#22254↓0.09↓0.5 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Alchemax Slayer-Bots96%
$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 Patrol96%
$0.21↑#29666↓0.160.3 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Rowdy Snowballers96%
$0.10#13824↑0.170.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Fear of Immobility96%
$0.13↑#176540.252.1 years↓
"When this creature enters, tap up to one target creature. If an opponent controls that creature, put a stun counter on it."
Utrom Scientists96%
$0.06↓#21901↓0.310.6 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Dragon Turtle95%
$0.33↑#11751↑0.36↑5.2 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."
Take into Custody94%
$0.04↓#23846↓0.06↓9.7 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
Gilded Scuttler94%
$0.34↑#13567↑0.06↓1.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Press for Answers94%
$0.06↓#205460.12↓10.5 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
Celestial Regulator93%
$0.12↑#22266↓0.00↓4.5 years↓
"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."
Crippling Chill92%
$0.03↓#200020.2014.5 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
Collector's Case92%
$0.25↑#26013↓0.300.3 years↓
"When this artifact enters, tap up to one target creature and put two stun counters on it."