Chameleon, Master of Disguise {3}{U}
Legendary Creature — Human Shapeshifter Villain
You may have Chameleon enter as a copy of a creature you control, except his name is Chameleon, Master of Disguise.
Mayhem {2}{U} (You may cast this card from your graveyard for {2}{U} if you discarded it this turn. Timing rules still apply.)
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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.
The Master, Formed Anew 87%
$0.22#19011
"You may have this card enter as a copy of a creature card in exile with a takeover counter on it."
Superior Spider-Man 86%
$1.83#7692
"You may have this card enter as a copy of any creature card in a graveyard, except his name is this card and he's a 4/4 Spider Human Hero in addition to his other types. When you do, exile that card."
Mocking Doppelganger 83%
$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.""
Visage Bandit 82%
$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."
+1 more matching line
Glasspool Mimic // Glasspool Shore 82%
$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."
Body Double 81%
$0.31#6056
"You may have this creature enter as a copy of any creature card in a graveyard."