Doc Ock's Henchmen 
Creature — Human Villain
$0.16 #13496 0.56 1.1 years
Flash
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 Doc Ock's Henchmen 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 Skirmisher100%
$0.26↑#24329↓0.12↓0.3 years
"Whenever this creature attacks, it connives."
Kang, Temporal Tyrant96%
$0.18↑#9534↑0.15↓0.3 years
"Whenever this card attacks, he connives."
Ultron, Unlimited95%
$1.03↑#8630↑0.45↓0.3 years
"Whenever this card attacks, he connives."
Scurrilous Sentry94%
$0.11↓#16418↓0.00↓2.3 years↑
"Whenever this creature enters or attacks, it connives."
Tiger Shark, Abyssal Hunter92%
$0.26↑#23975↓0.20↓0.3 years
"Whenever this card enters or attacks, he connives."
Copycrook90%
$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.""
Raffine, Scheming Seer86%
$3.91↑#4474↑0.37↓4.5 years↑
"Whenever you attack, target attacking creature connives X, where X is the number of attacking creatures."
Hypnotic Grifter86%
$0.23↑#22594↓0.12↓4.5 years↑
"
: This creature connives."
: This creature connives."
Illuminator Virtuoso85%
$0.21↑#16668↓0.06↓4.5 years↑
"Whenever this creature becomes the target of a spell you control, it connives."
Swordsman, Sharp Scoundrel84%
$0.11↓#20117↓0.11↓0.3 years
"Whenever an equipped creature you control attacks, it connives."
Raffine's Informant84%
$0.25↑#21046↓0.00↓4.5 years↑
"When this creature enters, it connives."
Psionic Snoop84%
$0.10↓#26022↓0.27↓4.5 years↑
"When this creature enters, it connives."
Red Room Recruit84%
$0.13↓#19330↓0.12↓0.3 years
"When this creature enters, it connives."
Echo Inspector84%
$0.06↓#24055↓0.00↓4.5 years↑
"When this creature enters, it connives."
Revel Ruiner84%
$0.04↓#25192↓0.00↓4.5 years↑
"When this creature enters, it connives."
Prowler, Clawed Thief83%
$0.21↑#7387↑0.82↑1.1 years
"Whenever another Villain you control enters, this card connives."
Namor, Scourge of the Seas81%
$0.89↑#17874↓0.39↓0.3 years
"At the beginning of combat on your turn, target creature you control connives."
Adventurer's Airship80%
$0.21↑#10652↑0.07↓1.4 years
"Whenever this Vehicle attacks, draw a card, then discard a card."
Stadium Tidalmage80%
$0.07↓#23958↓0.01↓0.5 years
"Whenever this creature enters or attacks, you may draw a card. If you do, discard a card."
Furtive Courier79%
$0.04↓#26972↓0.06↓2.7 years↑
"Whenever this creature attacks, draw a card, then discard a card."