Prowler, Clawed Thief 
Legendary Creature — Human Rogue Villain
$0.21 #7387 0.82 1.1 years
Menace (This creature can't be blocked except by two or more creatures.)
Whenever another Villain you control enters, Prowler 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 Prowler, Clawed Thief 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.
Baron Strucker, HYDRA Overlord96%
$0.20↓#78080.21↓0.3 years
"Whenever another Villain you control enters, you may have it connive. Do this only once each turn."
Villainous Hideout86%
$0.22↑#76110.16↓0.3 years
"
, 
: Target Villain you control connives. Activate only as a sorcery."
, : Target Villain you control connives. Activate only as a sorcery."
Flying Octobot86%
$0.12↓#15204↓0.29↓1.1 years
"Whenever another Villain you control enters, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Scurrilous Sentry84%
$0.11↓#16418↓0.00↓2.3 years↑
"Whenever this creature enters or attacks, it connives."
+1 more matching line
Atlantean Skirmisher83%
$0.26↑#24329↓0.12↓0.3 years
"Whenever this creature attacks, it connives."
Doc Ock's Henchmen83%
$0.16↓#13496↓0.56↓1.1 years
"Whenever this creature attacks, it connives."
Venom, Eddie Brock82%
$15.88↑#11927↓0.16↓1.1 years
"Menace"
Revel Ruiner81%
$0.04↓#25192↓0.00↓4.5 years↑
"When this creature enters, it connives."
+1 more matching line
Echo Inspector81%
$0.06↓#24055↓0.00↓4.5 years↑
"When this creature enters, it connives."
Illuminator Virtuoso81%
$0.21#16668↓0.06↓4.5 years↑
"Whenever this creature becomes the target of a spell you control, it connives."
Doctor Doom, King of Latveria81%
$1.04↑#85170.48↓0.3 years
"At the beginning of combat on your turn, target Villain you control gains menace until end of turn. It connives."
Hypnotic Grifter81%
$0.23↑#22594↓0.12↓4.5 years↑
": This creature connives."
: This creature connives."
Tiger Shark, Abyssal Hunter80%
$0.26↑#23975↓0.20↓0.3 years
"Whenever this card enters or attacks, he connives."
Swordsman, Sharp Scoundrel80%
$0.11↓#20117↓0.11↓0.3 years
"Whenever an equipped creature you control attacks, it connives."
Gluttonous Slug80%
$0.17↓#20746↓0.00↓7.4 years↑
"Menace"
Deep Goblin Skulltaker80%
$0.15↓#19093↓0.00↓2.9 years↑
"Menace"
Raffine's Informant80%
$0.25↑#21046↓0.00↓4.5 years↑
"When this creature enters, it connives."
Psionic Snoop80%
$0.10↓#26022↓0.27↓4.5 years↑
"When this creature enters, it connives."
Red Room Recruit80%
$0.13↓#19330↓0.12↓0.3 years
"When this creature enters, it connives."
Valentina Allegra de Fontaine79%
$0.26↑#22025↓0.24↓0.3 years
": Target Hero you control connives. Activate only as a sorcery."
: Target Hero you control connives. Activate only as a sorcery."