Callidus Assassin {4}{U}{B}
Creature — Human Shapeshifter Assassin
Flash
Polymorphine — You may have this creature enter tapped as a copy of any creature on the battlefield, except it has "When this creature enters, destroy up to one other target creature with the same name as this creature."
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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.
Stunt Double 82%
$4.51#3870
"You may have this creature enter as a copy of any creature on the battlefield."
+1 more matching line
Naga Fleshcrafter 82%
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"You may have this creature enter as a copy of any creature on the battlefield."
Clone 82%
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"You may have this creature enter as a copy of any creature on the battlefield."
Undercover Operative 81%
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"You may have this creature enter as a copy of any creature on the battlefield, except it enters with a shield counter on it if you control that creature."
Gigantoplasm 80%
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"You may have this creature enter as a copy of any creature on the battlefield, except it has "{X}: This creature has base power and toughness X/X.""