Watertrap Weaver 
Creature — Merfolk Wizard
$0.06 #22206 0.53 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.
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Cards similar to Watertrap Weaver 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.
Stitched Mangler100%
$0.11↑#210620.18↓10.4 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Kor Hookmaster100%
$0.05↓#256060.13↓16.9 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Frost Lynx100%
$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."
Frost Trickster100%
$0.10↑#17571↑0.11↓5.4 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Spire Patrol100%
$0.21↑#28315↓0.18↓9.6 years
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Chillbringer100%
$0.05↓#260130.06↓7.6 years↓
"When this creature enters, tap target creature an opponent controls. It doesn't untap during its controller's next untap step."
Fractal Mascot96%
$0.13↑#225950.00↓0.4 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Rowdy Snowballers96%
$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 Patrol96%
$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-Bots96%
$0.22↑#181290.17↓0.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Fear of Immobility96%
$0.11↑#17042↑0.18↓1.9 years↓
"When this creature enters, tap up to one target creature. If an opponent controls that creature, put a stun counter on it."
White Dragon96%
$0.15↑#16285↑0.06↓5.1 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Utrom Scientists96%
$0.13↑#221620.00↓0.5 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Dragon Turtle96%
$0.32↑#11469↑0.27↓5.1 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 Custody95%
$0.05↓#235290.27↓9.6 years
"Tap target creature. It doesn't untap during its controller's next untap step."
Press for Answers94%
$0.05↓#202170.11↓10.4 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
Gilded Scuttler94%
$0.26↑#14055↑0.15↓1.8 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Crippling Chill93%
$0.03↓#197450.12↓14.3 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
Collector's Case93%
$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."
Celestial Regulator93%
$0.16↑#219420.14↓4.4 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."