Copycrook 
Creature — Shapeshifter Rogue
$0.31 #5982 0.21 2.3 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." (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on this creature.)
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Cards similar to Copycrook 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.
Atlantean Skirmisher90%
$0.26↓#24329↓0.120.3 years↓
"Whenever this creature attacks, it connives."
Doc Ock's Henchmen90%
$0.16↓#13496↓0.56↑1.1 years↓
"Whenever this creature attacks, it connives."
Scurrilous Sentry87%
$0.11↓#16418↓0.00↓2.3 years
"Whenever this creature enters or attacks, it connives."
Tiger Shark, Abyssal Hunter84%
$0.26↓#23975↓0.200.3 years↓
"Whenever this card enters or attacks, he connives."
Kang, Temporal Tyrant82%
$0.18↓#9534↓0.150.3 years↓
"Whenever this card attacks, he connives."
Ultron, Unlimited82%
$1.03↑#8630↓0.45↑0.3 years↓
"Whenever this card attacks, he connives."
Clone80%
$0.30↓#3704↑0.37↑33.2 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Stunt Double80%
$4.21↑#3814↑0.38↑10.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Mirror Image79%
$0.30↓#51890.06↓8.3 years↑
"You may have this creature enter as a copy of a creature you control."
Illuminator Virtuoso79%
$0.21↓#16668↓0.06↓4.5 years↑
"Whenever this creature becomes the target of a spell you control, it connives."
Dack's Duplicate76%
$0.31#11445↓0.2412.4 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it has haste and dethrone."
Hypnotic Grifter76%
$0.23↓#22594↓0.124.5 years↑
"
: This creature connives."
: This creature connives."
Altered Ego76%
$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."
Protean Raider76%
$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."
Glasspool Mimic // Glasspool Shore74%
$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."
Swordsman, Sharp Scoundrel74%
$0.11↓#20117↓0.110.3 years↓
"Whenever an equipped creature you control attacks, it connives."
Prowler, Clawed Thief74%
$0.21↓#7387↓0.82↑1.1 years↓
"Whenever another Villain you control enters, this card connives."
Quicksilver Gargantuan74%
$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."
Raffine's Informant73%
$0.25↓#21046↓0.00↓4.5 years↑
"When this creature enters, it connives."
Psionic Snoop73%
$0.10↓#26022↓0.274.5 years↑
"When this creature enters, it connives."