Prowler, Clawed Thief 
Legendary Creature — Human Rogue Villain
$0.17 #7971 0.27 1.0 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%
$0.19↑#87760.00↓0.2 years
"Whenever another Villain you control enters, you may have it connive. Do this only once each turn."
Venom, Eddie Brock89%
$15.25↑#12059↓0.47↑0.9 years
"Menace"
Villainous Hideout86%
$0.21↑#86020.00↓0.2 years
"
, 
: Target Villain you control connives. Activate only as a sorcery."
, : Target Villain you control connives. Activate only as a sorcery."
Flying Octobot86%
$0.17#15154↓0.40↑1.0 years
"Whenever another Villain you control enters, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Scurrilous Sentry84%
$0.13↓#16093↓0.00↓2.2 years↑
"Whenever this creature enters or attacks, it connives."
+1 more matching line
Atlantean Skirmisher84%
$0.28↑#24942↓0.00↓0.2 years
"Whenever this creature attacks, it connives."
Doc Ock's Henchmen84%
$0.17#13562↓0.251.0 years
"Whenever this creature attacks, it connives."
Illuminator Virtuoso82%
$0.23↑#16421↓0.274.4 years↑
"Whenever this creature becomes the target of a spell you control, it connives."
Tiger Shark, Abyssal Hunter81%
$0.23↑#24569↓0.00↓0.2 years
"Whenever this card enters or attacks, he connives."
Echo Inspector81%
$0.08↓#23729↓0.15↓4.4 years↑
"When this creature enters, it connives."
Revel Ruiner81%
$0.04↓#24823↓0.12↓4.4 years↑
"When this creature enters, it connives."
+1 more matching line
Doctor Doom, King of Latveria81%
$1.90↑#95210.00↓0.2 years
"At the beginning of combat on your turn, target Villain you control gains menace until end of turn. It connives."
Hypnotic Grifter81%
$0.18↑#22302↓0.00↓4.4 years↑
": This creature connives."
: This creature connives."
Deep Goblin Skulltaker81%
$0.18↑#18687↓0.00↓2.8 years↑
"Menace"
Gluttonous Slug81%
$0.15↓#20404↓0.357.2 years↑
"Menace"
Red Room Recruit80%
$0.21↑#20241↓0.00↓0.2 years
"When this creature enters, it connives."
Raffine's Informant80%
$0.22↑#20795↓0.00↓4.4 years↑
"When this creature enters, it connives."
Psionic Snoop80%
$0.14↓#25755↓0.53↑4.4 years↑
"When this creature enters, it connives."
Swordsman, Sharp Scoundrel80%
$0.18↑#21010↓0.00↓0.2 years
"Whenever an equipped creature you control attacks, it connives."
Valentina Allegra de Fontaine79%
$0.34↑#22544↓0.00↓0.2 years
": Target Hero you control connives. Activate only as a sorcery."
: Target Hero you control connives. Activate only as a sorcery."