Utrom Scientists {2}{U}
Artifact Creature — Utrom Robot Scientist
When this creature enters, tap up to one target creature and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)
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Cards that do something similar 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.
Splash Lasher 100%
$0.19#8234
"When this creature enters, tap up to one target creature and put a stun counter on it."
Dreamdew Entrancer 93%
$0.31#6526
"When this creature enters, tap up to one target creature and put three stun counters on it. If you control that creature, draw two cards."