Body Double 

Creature — Shapeshifter
You may have this creature enter as a copy of any creature card in a graveyard.
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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.
Mocking Doppelganger 92%
$4.33#5325
"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.""
Sakashima's Protege 91%
$0.45#5882
"You may have this creature enter as a copy of any permanent that entered this turn."
Activated Sleeper 90%
$1.54#8499
"You may have this creature enter as a copy of any creature card in a graveyard that was put there from the battlefield this turn, except it's a Phyrexian in addition to its other types."
Waxen Shapethief 90%
$0.38#6388
"You may have this creature enter as a copy of an artifact or creature you control."
Hulking Metamorph 89%
$0.18#7907
"You may have this creature enter as a copy of an artifact or creature you control, except it's an artifact creature in addition to its other types, and its power and toughness are equal to this creature's power and toughness."
Phyrexian Metamorph 89%
$2.32#306
"You may have this creature enter as a copy of any artifact or creature on the battlefield, except it's an artifact in addition to its other types."
Stunt Double 89%
$4.51#3870
"You may have this creature enter as a copy of any creature on the battlefield."
Naga Fleshcrafter 89%
$0.33#5377
"You may have this creature enter as a copy of any creature on the battlefield."
Clone 89%
$0.63#3831
"You may have this creature enter as a copy of any creature on the battlefield."
Visage Bandit 88%
$0.22#7472
"You may have this creature enter as a copy of a creature you control, except it's a Shapeshifter Rogue in addition to its other types."
Glasspool Mimic // Glasspool Shore 88%
$6.45#1180
"You may have this creature enter as a copy of a creature you control, except it's a Shapeshifter Rogue in addition to its other types."
Vizier of Many Faces 87%
$0.30#4322
"You may have this creature enter as a copy of any creature on the battlefield, except if this creature was embalmed, the token has no mana cost, it's white, and it's a Zombie in addition to its other types."
Undercover Operative 87%
$0.37#5367
"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."
Auton Soldier 87%
$10.83#2016
"You may have this creature enter as a copy of any creature on the battlefield, except it isn't legendary, is an artifact in addition to its other types, and has myriad."
Jwari Shapeshifter 87%
$3.79#10849
"You may have this creature enter as a copy of any Ally creature on the battlefield."
Progenitor Mimic 87%
$1.38#5243
"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.""
Vesuvan Doppelganger 87%
#16958
"You may have this creature enter as a copy of any creature on the battlefield, except it doesn't copy that creature's color and it has "At the beginning of your upkeep, you may have this creature become a copy of target creature, except it doesn't copy that creature's color and it has this ability.""
Spark Double 87%
$14.28#401
"You may have this creature enter as a copy of a creature or planeswalker you control, except it enters with an additional +1/+1 counter on it if it's a creature, it enters with an additional loyalty counter on it if it's a planeswalker, and it isn't legendary."