Scurrilous Sentry 
Creature — Human Knight Rogue
$0.13 #16093 0.00 2.2 years
Menace
Whenever this creature enters or 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 Scurrilous Sentry 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.
Tiger Shark, Abyssal Hunter98%
$0.23↑#24569↓0.000.2 years↓
"Whenever this card enters or attacks, he connives."
Atlantean Skirmisher94%
$0.28↑#24942↓0.000.2 years↓
"Whenever this creature attacks, it connives."
Doc Ock's Henchmen94%
$0.17↑#135620.25↑1.0 years↓
"Whenever this creature attacks, it connives."
Stadium Tidalmage91%
$0.03↓#24215↓0.000.4 years↓
"Whenever this creature enters or attacks, you may draw a card. If you do, discard a card."
Ultron, Unlimited88%
$0.64↑#9700↑0.000.2 years↓
"Whenever this card attacks, he connives."
Kang, Temporal Tyrant88%
$0.15↑#10566↑0.000.2 years↓
"Whenever this card attacks, he connives."
Revel Ruiner88%
$0.04↓#24823↓0.12↑4.4 years↑
"When this creature enters, it connives."
+1 more matching line
Echo Inspector88%
$0.08↓#23729↓0.15↑4.4 years↑
"When this creature enters, it connives."
Copycrook87%
$0.27↑#6076↑0.27↑2.2 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.""
Red Room Recruit86%
$0.21↑#20241↓0.000.2 years↓
"When this creature enters, it connives."
Raffine's Informant86%
$0.22↑#20795↓0.004.4 years↑
"When this creature enters, it connives."
Psionic Snoop86%
$0.14↑#25755↓0.53↑4.4 years↑
"When this creature enters, it connives."
Dreadwing Scavenger84%
$0.21↑#11074↑0.12↑1.8 years
"Whenever this creature enters or attacks, draw a card, then discard a card."
Prowler, Clawed Thief84%
$0.17↑#7971↑0.27↑1.0 years↓
"Whenever another Villain you control enters, this card connives."
+1 more matching line
Illuminator Virtuoso84%
$0.23↑#164210.27↑4.4 years↑
"Whenever this creature becomes the target of a spell you control, it connives."
Deep Goblin Skulltaker83%
$0.18↑#186870.002.8 years
"Menace"
Grime Gorger82%
$0.23↑#21790↓0.33↑4.4 years↑
"Menace"
Overlord of the Floodpits82%
$2.31↑#2888↑0.27↑1.9 years
"Whenever this permanent enters or attacks, draw two cards, then discard a card."
Mob Lookout82%
$0.16↑#153490.26↑1.0 years↓
"When this creature enters, target creature you control connives."
Hypnotic Grifter81%
$0.18↑#22302↓0.004.4 years↑
": This creature connives."
: This creature connives."