Wavecrash Triton 

Creature — Merfolk Wizard
$0.12 #26629 0.13 13.1 years
Heroic — Whenever you cast a spell that targets this creature, 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 Wavecrash Triton 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.
Elite Skirmisher96%
$0.12#273470.0512.7 years
"Whenever you cast a spell that targets this creature, you may tap target creature."
Quiet Contemplation91%
$0.20↑#19052↑0.55↑12.1 years
"Whenever you cast a noncreature spell, you may pay
. If you do, tap target creature an opponent controls and it doesn't untap during its controller's next untap step."
Mouse Trapper86%
$0.21↑#12960↑0.072.2 years↓
"Whenever this creature becomes the target of a spell or ability you control for the first time each turn, tap target creature an opponent controls."
Shackle Slinger85%
$0.25↑#15922↑0.41↑2.5 years↓
"Whenever you cast your second spell each turn, choose target creature an opponent controls. If it's tapped, put a stun counter on it. Otherwise, tap it."
Take into Custody85%
$0.04↓#238460.069.7 years↓
"Tap target creature. It doesn't untap during its controller's next untap step."
Frost Lynx84%
$0.04↓#20063↑0.27↑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 Trickster84%
$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 Patrol84%
$0.05↓#286180.049.7 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Stitched Mangler84%
$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 Weaver84%
$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 Hookmaster84%
$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."
Chillbringer84%
$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."
Niblis of Frost84%
$0.37↑#8253↑0.62↑10.2 years↓
"Whenever you cast an instant or sorcery spell, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Arena Athlete84%
$0.13↑#247290.1213.1 years
"Whenever you cast a spell that targets this creature, target creature an opponent controls can't block this turn."
Press for Answers84%
$0.06↓#20546↑0.1210.5 years↓
"Tap target creature. It doesn't untap during its controller's next untap step."
Petrifying Meddler82%
$0.10↓#20372↑0.142.3 years↓
"When you cast this spell, tap up to one target creature and put a stun counter on it."
Tranquilize82%
$0.14↑#13245↑0.26↑2.3 years↓
"Tap target creature an opponent controls and put three stun counters on it."
Procrastinate82%
$0.18↑#12678↑0.23↑0.5 years↓
"Tap target creature. Put twice X stun counters on it."