Doc Ock's Henchmen 
Creature — Human Villain
$0.17 #13562 0.25 1.0 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%
$0.28↑#24942↓0.00↓0.2 years
"Whenever this creature attacks, it connives."
Kang, Temporal Tyrant96%
$0.15↓#10566↑0.00↓0.2 years
"Whenever this card attacks, he connives."
Ultron, Unlimited95%
$0.64↑#9700↑0.00↓0.2 years
"Whenever this card attacks, he connives."
Scurrilous Sentry94%
$0.13↓#160930.00↓2.2 years↑
"Whenever this creature enters or attacks, it connives."
Tiger Shark, Abyssal Hunter92%
$0.23↑#24569↓0.00↓0.2 years
"Whenever this card enters or attacks, he connives."
Copycrook90%
$0.27↑#6076↑0.272.2 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.""
Hypnotic Grifter86%
$0.18↑#22302↓0.00↓4.4 years↑
"
: This creature connives."
: This creature connives."
Raffine, Scheming Seer85%
$2.43↑#4888↑0.36↑4.4 years↑
"Whenever you attack, target attacking creature connives X, where X is the number of attacking creatures."
Illuminator Virtuoso85%
$0.23↑#16421↓0.274.4 years↑
"Whenever this creature becomes the target of a spell you control, it connives."
Red Room Recruit84%
$0.21↑#20241↓0.00↓0.2 years
"When this creature enters, it connives."
Raffine's Informant84%
$0.22↑#20795↓0.00↓4.4 years↑
"When this creature enters, it connives."
Psionic Snoop84%
$0.14↓#25755↓0.53↑4.4 years↑
"When this creature enters, it connives."
+1 more matching line
Echo Inspector84%
$0.08↓#23729↓0.15↓4.4 years↑
"When this creature enters, it connives."
Revel Ruiner84%
$0.04↓#24823↓0.12↓4.4 years↑
"When this creature enters, it connives."
Prowler, Clawed Thief84%
$0.17#7971↑0.271.0 years
"Whenever another Villain you control enters, this card connives."
Swordsman, Sharp Scoundrel83%
$0.18↑#21010↓0.00↓0.2 years
"Whenever an equipped creature you control attacks, it connives."
Adventurer's Airship80%
$0.19↑#10821↑0.221.2 years
"Whenever this Vehicle attacks, draw a card, then discard a card."
Stadium Tidalmage80%
$0.03↓#24215↓0.00↓0.4 years
"Whenever this creature enters or attacks, you may draw a card. If you do, discard a card."
Overwhelmed Archivist // Archive Haunt80%
$0.15↓#23930↓0.12↓4.9 years↑
"Whenever this creature attacks, draw a card, then discard a card."
Furtive Courier79%
$0.03↓#26725↓0.272.6 years↑
"Whenever this creature attacks, draw a card, then discard a card."