Callidus Assassin 
Creature — Human Shapeshifter Assassin
$5.50 #5874 0.47 3.9 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%
$0.42↓#68890.21↓14.9 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%
$5.74↑#48270.17↓3.9 years
"Flash"
Sautekh Immortal76%
$0.35↓#16208↓0.25↓3.9 years
"Flash"
Stunt Double74%
$4.07↓#3805↑0.22↓10.0 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Clone74%
$0.31↓#3742↑0.31↓33.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Mocking Doppelganger72%
$3.39↓#54550.21↓4.2 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↓#53820.19↓8.1 years↑
"You may have this creature enter as a copy of a creature you control."
Shadow Kin72%
$0.81↓#7857↓0.474.9 years↑
"Flash"
Ravener72%
$1.14↓#10109↓0.35↓3.9 years
"Flash"
Sister of Silence71%
$0.41↓#12746↓0.61↑3.9 years
"Flash"
Progenitor Mimic70%
$1.11↓#53700.4313.3 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.""