Chameleon, Master of Disguise 

Legendary Creature — Human Shapeshifter Villain
$0.39 #1718 0.38 1.1 years
You may have Chameleon enter as a copy of a creature you control, except his name is Chameleon, Master of Disguise.
Mayhem 
(You may cast this card from your graveyard for 
if you discarded it this turn. Timing rules still apply.)
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Cards similar to Chameleon, Master of Disguise 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.
Mirror Image89%
$0.30↓#5189↓0.06↓8.3 years↑
"You may have this creature enter as a copy of a creature you control."
Clone88%
$0.30↓#3704↓0.3733.2 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Stunt Double88%
$4.21↑#3814↓0.3810.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Visage Bandit86%
$0.17↓#7390↓0.15↓2.5 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."
Sakashima the Impostor86%
$13.20↑#20430.52↑21.4 years↑
"You may have this card enter as a copy of any creature on the battlefield, except its name is this card, it's legendary in addition to its other types, and it has "

: Return this card to its owner's hand at the beginning of the next end step.""
Glasspool Mimic // Glasspool Shore85%
$6.55↑#1165↑0.27↓6.1 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."
Quicksilver Gargantuan82%
$0.51↑#18556↓0.4316.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."