Waxen Shapethief 

Creature — Shapeshifter
Flash
You may have this creature enter as a copy of an artifact or creature you control.
Cycling {2} ({2}, Discard this card: Draw a card.)
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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.
Hulking Metamorph 95%
$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 94%
$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."
Body Double 90%
$0.31#6056
"You may have this creature enter as a copy of any creature card in a graveyard."
Mocking Doppelganger 89%
$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.""
+1 more matching line
Sakashima's Protege 87%
$0.45#5882
"You may have this creature enter as a copy of any permanent that entered this turn."
+1 more matching line
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."
Activated Sleeper 87%
$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."
Jwari Shapeshifter 86%
$3.79#10849
"You may have this creature enter as a copy of any Ally creature on the battlefield."
Undercover Operative 86%
$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."
Stunt Double 86%
$4.51#3870
"You may have this creature enter as a copy of any creature on the battlefield."
+1 more matching line
Naga Fleshcrafter 86%
$0.33#5377
"You may have this creature enter as a copy of any creature on the battlefield."
Clone 86%
$0.63#3831
"You may have this creature enter as a copy of any creature on the battlefield."
Synth Infiltrator 85%
$0.25#8793
"You may have this creature enter as a copy of any creature on the battlefield, except it's a Synth artifact creature in addition to its other types."
Vizier of Many Faces 85%
$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."
Progenitor Mimic 85%
$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.""
Pirated Copy 84%
$7.51#8155
"You may have this creature enter as a copy of any creature on the battlefield, except it's a Pirate in addition to its other types and it has "Whenever this creature or another creature with the same name deals combat damage to a player, you draw a card.""
Visage Bandit 84%
$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 84%
$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."