Constrictor Sage {4}{U}
Creature — Snake Wizard
When this creature enters, tap target creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)
Renew — {2}{U}, Exile this card from your graveyard: Tap target creature an opponent controls and put a stun counter on it. Activate only as a sorcery.
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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.
Alchemax Slayer-Bots 100%
$0.27#18180
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol 100%
$0.29#30886
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Frostfist Strider 100%
$0.14#22300
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Gilded Scuttler 100%
$0.25#15022
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Referee Squad 100%
$0.20#18892
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Rowdy Snowballers 100%
$0.10#14139
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Floodpits Drowner 100%
$0.38#8304
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Deluge Virtuoso 100%
$0.15#22270
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Sharae of Numbing Depths 83%
$0.25#7303
"When Sharae enters, tap target creature an opponent controls and put a stun counter on it."
Fractal Mascot 82%
$0.17#23132
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."