Watertrap Weaver 
Creature — Merfolk Wizard
$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.
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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.
Frost Lynx100%
$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."
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."
Kor Hookmaster100%
$0.05↓#258850.06↓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."
Frost Trickster100%
$0.10↑#17862↑0.25↓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."
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↓#262680.06↓7.7 years↓
"When this creature enters, tap target creature an opponent controls. It doesn't untap during its controller's next untap step."
Fractal Mascot96%
$0.09↑#222540.09↓0.5 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Alchemax Slayer-Bots96%
$0.19↑#180340.431.1 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol96%
$0.21↑#29666↓0.16↓0.3 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Rowdy Snowballers96%
$0.10↑#13824↑0.17↓0.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Fear of Immobility96%
$0.13↑#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."
White Dragon96%
$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."
Utrom Scientists96%
$0.06↓#219010.310.6 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Dragon Turtle96%
$0.33↑#11751↑0.365.2 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 Custody95%
$0.04↓#238460.06↓9.7 years
"Tap target creature. It doesn't untap during its controller's next untap step."
Press for Answers94%
$0.06↓#205460.12↓10.5 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."
Crippling Chill93%
$0.03↓#200020.20↓14.5 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
Celestial Regulator93%
$0.12↑#222660.00↓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."
Donatello, Rad Scientist93%
$0.35↑#187000.450.6 years↓
"When this card enters, tap up to three target creatures your opponents control. Put a stun counter on each of them."