Wavecrash Triton {2}{U}
Creature — Merfolk Wizard
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 that do something similar expected a card that isn't here?
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Mouse Trapper 92%
$0.22#12030
"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."
Vizier of the True 82%
$0.05#28277
"Whenever you exert a creature, tap target creature an opponent controls."