Scurrilous Sentry 
Creature — Human Knight Rogue
$0.11 #16418 0.00 2.3 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%
$0.26↑#23975↓0.20↑0.3 years↓
"Whenever this card enters or attacks, he connives."
Atlantean Skirmisher94%
$0.26↑#24329↓0.12↑0.3 years↓
"Whenever this creature attacks, it connives."
Doc Ock's Henchmen94%
$0.16↑#134960.56↑1.1 years↓
"Whenever this creature attacks, it connives."
Stadium Tidalmage91%
$0.07↓#23958↓0.010.5 years↓
"Whenever this creature enters or attacks, you may draw a card. If you do, discard a card."
Kang, Temporal Tyrant88%
$0.18↑#9534↑0.15↑0.3 years↓
"Whenever this card attacks, he connives."
Ultron, Unlimited88%
$1.03↑#8630↑0.45↑0.3 years↓
"Whenever this card attacks, he connives."
Revel Ruiner88%
$0.04↓#25192↓0.004.5 years↑
"When this creature enters, it connives."
+1 more matching line
Echo Inspector88%
$0.06↓#24055↓0.004.5 years↑
"When this creature enters, it connives."
Copycrook87%
$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's Informant86%
$0.25↑#21046↓0.004.5 years↑
"When this creature enters, it connives."
Psionic Snoop86%
$0.10↓#26022↓0.27↑4.5 years↑
"When this creature enters, it connives."
Red Room Recruit86%
$0.13↑#193300.12↑0.3 years↓
"When this creature enters, it connives."
Dreadwing Scavenger85%
$0.22↑#11031↑0.18↑1.9 years
"Whenever this creature enters or attacks, draw a card, then discard a card."
Prowler, Clawed Thief84%
$0.21↑#7387↑0.82↑1.1 years↓
"Whenever another Villain you control enters, this card connives."
+1 more matching line
Illuminator Virtuoso84%
$0.21↑#166680.064.5 years↑
"Whenever this creature becomes the target of a spell you control, it connives."
Deep Goblin Skulltaker82%
$0.15↑#190930.002.9 years
"Menace"
Grime Gorger82%
$0.24↑#22293↓0.12↑4.5 years↑
"Menace"
Mob Lookout82%
$0.09↓#153710.001.1 years↓
"When this creature enters, target creature you control connives."
Raffine, Scheming Seer82%
$3.91↑#4474↑0.37↑4.5 years↑
"Whenever you attack, target attacking creature connives X, where X is the number of attacking creatures."
Overlord of the Floodpits81%
$2.15↑#3007↑0.16↑2.1 years
"Whenever this permanent enters or attacks, draw two cards, then discard a card."