Kinscaer Harpoonist 

Creature — Kithkin Soldier
$0.06 #31382 0.06 18.3 years
Flying
Whenever this creature attacks, you may have target creature lose flying until end of turn.
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Cards similar to Kinscaer Harpoonist 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.
Fear of Falling93%
$0.20↑#18809↑0.081.9 years↓
"Whenever this creature attacks, target creature defending player controls gets -2/-0 and loses flying until your next turn."
Gravity Well88%
$0.64↑#13630↑0.1216.4 years↓
"Whenever a creature with flying attacks, it loses flying until end of turn."
Adarkar Windform87%
$0.24↑#22774↑0.17↑20.1 years↑
"
: Target creature loses flying until end of turn."
+1 more matching line
Burrenton Shield-Bearers80%
$0.19↑#300470.24↑18.6 years
"Whenever this creature attacks, target creature gets +0/+3 until end of turn."
Kinsbaile Balloonist75%
$0.14↑#263150.53↑18.9 years
"Whenever this creature attacks, you may have target creature gain flying until end of turn."
Wingshield Agent74%
$0.08↑#259960.064.4 years↓
"Whenever this creature attacks, up to one other target creature gains flying until end of turn."