Stalking Leonin {2}{W}
Creature — Cat Archer
When this creature enters, secretly choose an opponent.
Reveal the player you chose: Exile target creature that's attacking you if it's controlled by the chosen player. Activate only once.
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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.
Emissary of Grudges 100%
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"As this creature enters, secretly choose an opponent."
+1 more matching line
Guardian Archon 100%
$0.21#23024
"As this creature enters, secretly choose an opponent."
+1 more matching line
Entropic Specter 81%
$0.39#26808
"As this creature enters, choose an opponent."
+1 more matching line