Callidus Assassin 
Creature — Human Shapeshifter Assassin
$4.45 #6093 0.78 4.0 years
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 similar to Callidus Assassin 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.
Evil Twin94%
$0.40↓#69990.53↓15.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it has ", 
: Destroy target creature with the same name as this creature.""
, : Destroy target creature with the same name as this creature.""
Necron Deathmark82%
$4.59↑#50200.63↓4.0 years
"Flash"
Clone74%
$0.30↓#3704↑0.37↓33.2 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Stunt Double74%
$4.21↓#3814↑0.38↓10.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Mocking Doppelganger72%
$2.79↓#55590.48↓4.4 years
"You may have this creature enter as a copy of a creature an opponent controls, except it has "Other creatures with the same name as this creature are goaded.""
+1 more matching line
Mirror Image72%
$0.30↓#51890.06↓8.3 years↑
"You may have this creature enter as a copy of a creature you control."
Ravener72%
$0.99↓#10340↓0.21↓4.0 years
"Flash"
Shadow Kin71%
$0.69↓#8120↓0.26↓5.1 years↑
"Flash"
Deathleaper, Terror Weapon71%
$0.55↓#11680↓0.27↓4.0 years
"Flash"
Sister of Silence71%
$0.41↓#12962↓0.00↓4.0 years
"Flash"
Sicarian Infiltrator70%
$4.25↓#69780.05↓4.0 years
"Flash"
Progenitor Mimic70%
$1.06↓#55060.27↓13.5 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it has "At the beginning of your upkeep, if this creature isn't a token, create a token that's a copy of this creature.""