Merchant of Venom 

Creature — Cat Warlock
Menace
When this creature enters, each player sacrifices a creature of their choice.
Whenever a player sacrifices a permanent, put a +1/+1 counter on this creature.
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Cards that do something similar 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.
Blood Aspirant 90%
$0.16#14835
"Whenever you sacrifice a permanent, put a +1/+1 counter on this creature."
Bloodbriar 89%
$0.31#18888
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Pirate Peddlers 89%
$0.14#15188
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Gixian Infiltrator 89%
$0.22#16413
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Sandbender Scavengers 89%
$0.21#17184
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Lokhust Heavy Destroyer 100%
$0.42#11033
"When this creature enters, each player sacrifices a creature of their choice."
Wasteland Raider 100%
$0.41#7995
"When this creature enters, each player sacrifices a creature of their choice."
Fleshbag Marauder 100%
$0.23#797
"When this creature enters, each player sacrifices a creature of their choice."
Slum Reaper 100%
$0.29#14338
"When this creature enters, each player sacrifices a creature of their choice."
Merciless Executioner 100%
$0.32#2218
"When this creature enters, each player sacrifices a creature of their choice."
Accursed Marauder 95%
$0.30#464
"When this creature enters, each player sacrifices a nontoken creature of their choice."
Chain Devil 95%
$0.25#11292
"When this creature enters, each player sacrifices a nontoken creature of their choice."
Giant Fly 80%
$0.17#28285
"Whenever you sacrifice another permanent, this creature gets +1/+0 until end of turn."
Benalish Sleeper 85%
$0.26#15761
"When this creature enters, if it was kicked, each player sacrifices a creature of their choice."