Machine God's Effigy 
Artifact
$6.43 #2964 0.06 3.9 years
You may have this artifact enter as a copy of any creature on the battlefield, except it's an artifact and it has "
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Cards similar to Machine God's Effigy 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.
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Clone83%
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"You may have this creature enter as a copy of any creature on the battlefield."
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"You may have this creature enter as a copy of any creature on the battlefield."
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Mirror Image82%
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"You may have this creature enter as a copy of a creature you control."
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Cursed Mirror81%
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"As this artifact enters, you may have it become a copy of any creature on the battlefield until end of turn, except it has haste."
Mind Stone80%
$0.25↓#32↑0.0029.4 years↑
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Quicksilver Gargantuan79%
$0.51↓#18556↓0.43↑16.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."
Serum Powder79%
$1.21↓#16329↓0.1022.7 years↑
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Magnifying Glass78%
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Gigantoplasm77%
$0.62↓#9049↓0.39↑10.9 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it has "
: This creature has base power and toughness X/X.""
: This creature has base power and toughness X/X.""
Simic Signet77%
$0.28↓#631↑0.0020.5 years↑
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Conversion Apparatus77%
$0.28↓#6084↓0.002.3 years↓
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Waxen Shapethief76%
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"You may have this creature enter as a copy of an artifact or creature you control."
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"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."
+1 more matching line
Progenitor Mimic76%
$1.06↓#5506↓0.27↑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.""