Wavecrash Triton 
Creature — Merfolk Wizard
$0.13 #26426 0.18 12.9 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%
$0.15↑#270980.00↓12.6 years
"Whenever you cast a spell that targets this creature, you may tap target creature."
Quiet Contemplation91%
$0.21↑#18701↑0.88↑11.9 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."
. If you do, tap target creature an opponent controls and it doesn't untap during its controller's next untap step."
Mouse Trapper86%
$0.24↑#12721↑0.00↓2.1 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%
$0.23↑#15701↑0.00↓2.4 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%
$0.05↓#235290.279.6 years↓
"Tap target creature. It doesn't untap during its controller's next untap step."
Stitched Mangler84%
$0.11↓#21062↑0.1810.4 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Kor Hookmaster84%
$0.05↓#256060.1316.9 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%
$0.06↓#222060.53↑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."
Frost Lynx84%
$0.04↓#19763↑0.41↑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."
Niblis of Frost84%
$0.37↑#8073↑0.2510.1 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%
$0.07↓#244250.07↓12.9 years
"Whenever you cast a spell that targets this creature, target creature an opponent controls can't block this turn."
Press for Answers84%
$0.05↓#20217↑0.1110.4 years↓
"Tap target creature. It doesn't untap during its controller's next untap step."
Frost Trickster84%
$0.10↓#17571↑0.115.4 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Spire Patrol84%
$0.21↑#283150.189.6 years↓
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Chillbringer84%
$0.05↓#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."
Collector's Case84%
$0.16↑#272150.00↓0.2 years↓
"
, 
: Tap target creature."
, : Tap target creature."
Petrifying Meddler82%
$0.13#19996↑0.06↓2.2 years↓
"When you cast this spell, tap up to one target creature and put a stun counter on it."
Tranquilize82%
$0.17↑#13061↑0.57↑2.2 years↓
"Tap target creature an opponent controls and put three stun counters on it."
Archipelagore82%
$0.13#9314↑0.47↑6.4 years↓
"Whenever this creature mutates, tap up to X target creatures, where X is the number of times this creature has mutated. Those creatures don't untap during their controller's next untap step."
Procrastinate82%
$0.20↑#13400↑0.00↓0.4 years↓
"Tap target creature. Put twice X stun counters on it."