Dack's Duplicate 
Creature — Shapeshifter
$0.31 #11445 0.24 12.4 years
You may have this creature enter as a copy of any creature on the battlefield, except it has haste and dethrone. (Whenever it attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)
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Cards similar to Dack's Duplicate 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.
Clone78%
$0.30↓#3704↑0.37↑33.2 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Stunt Double78%
$4.21↑#3814↑0.38↑10.1 years↓
"You may have this creature enter as a copy of any creature on the battlefield."
Copycrook76%
$0.31#5982↑0.212.3 years↓
"You may have this creature enter as a copy of any creature on the battlefield, except it has "Whenever this creature attacks, it connives.""
Mirror Image76%
$0.30↓#5189↑0.06↓8.3 years↓
"You may have this creature enter as a copy of a creature you control."
Cursed Mirror75%
$0.26↓#427↑0.165.5 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."
Protean Raider74%
$0.71↑#13786↓0.178.8 years↓
"If you attacked this turn, you may have this creature enter as a copy of any creature on the battlefield."
Quicksilver Gargantuan72%
$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."
Glasspool Mimic // Glasspool Shore70%
$6.55↑#1165↑0.276.1 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."
Progenitor Mimic70%
$1.06↑#5506↑0.2713.5 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.""
Altered Ego70%
$0.20↓#4024↑0.1510.5 years↓
"You may have this creature enter as a copy of any creature on the battlefield, except it enters with X additional +1/+1 counters on it."