Machine God's Effigy 
Artifact
$6.15 #2884 0.05 3.8 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.
Stunt Double83%
$4.07↓#3805↓0.22↑10.0 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Clone83%
$0.31↓#3742↓0.31↑33.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Mirror Image82%
$0.30↓#5382↓0.19↑8.1 years↑
"You may have this creature enter as a copy of a creature you control."
Orazca Relic82%
$0.11↓#15605↓0.33↑8.6 years↑
": Add 
."
: Add ."
Imposter Mech81%
$6.16↑#2227↑0.23↑4.5 years
"You may have this Vehicle enter as a copy of a creature an opponent controls, except it's a Vehicle artifact with crew 3 and it loses all other card types."
Mind Stone80%
$0.29↓#32↑0.0029.2 years↑
": Add ."
: Add ."
Mana Prism80%
$0.18↓#24925↓0.0029.9 years↑
": Add ."
: Add ."
Thought Vessel80%
$2.44↓#21↑0.27↑10.8 years↑
": Add ."
: Add ."
Liquimetal Torque80%
$2.74↓#514↑0.35↑5.2 years↑
": Add ."
: Add ."
Quicksilver Gargantuan79%
$0.54↓#18240↓0.1415.9 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."
Conversion Apparatus78%
$0.55↓#5942↓0.27↑2.2 years↓
": Add ."
: Add ."
Gigantoplasm77%
$0.49↓#9188↓0.0510.8 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%
$0.24↓#610↑0.27↑20.3 years↑
"
, : Add 
."
, : Add ."
Waxen Shapethief76%
$0.33↓#6103↓0.151.6 years↓
"You may have this creature enter as a copy of an artifact or creature you control."
Cursed Mirror76%
$0.78↓#453↑0.40↑5.4 years↑
"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."
Progenitor Mimic76%
$1.11↓#5370↓0.43↑13.3 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.""
Glasspool Mimic // Glasspool Shore76%
$5.87↓#1166↑0.21↑5.9 years↑
"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
Sculpting Steel75%
$1.58↓#664↑0.25↑22.9 years↑
"You may have this artifact enter as a copy of any artifact on the battlefield."
Synth Infiltrator75%
$0.27↓#8898↓0.43↑2.5 years↓
"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."
Mercurial Pretender75%
$0.15↓#17306↓0.0012.1 years↑
"You may have this creature enter as a copy of a creature you control, except it has "
: Return this creature to its owner's hand.""
: Return this creature to its owner's hand.""