Merchant of Venom 
Creature — Cat Warlock
$0.32 #11389 0.00 0.4 years
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 similar to Merchant of Venom 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.
Slum Reaper92%
$0.09↓#14623↓0.64↑13.9 years↑
"When this creature enters, each player sacrifices a creature of their choice."
Fleshbag Marauder92%
$0.18↓#812↑0.52↑17.9 years↑
"When this creature enters, each player sacrifices a creature of their choice."
Merciless Executioner92%
$0.38↑#2206↑0.41↑11.6 years↑
"When this creature enters, each player sacrifices a creature of their choice."
Abyssal Gorestalker90%
$0.21↓#14873↓0.53↑2.8 years↑
"When this creature enters, each player sacrifices two creatures of their choice."
Mortician Beetle90%
$1.68↑#99700.25↑16.4 years↑
"Whenever a player sacrifices a creature, you may put a +1/+1 counter on this creature."
Accursed Marauder90%
$0.32#474↑0.46↑2.2 years↑
"When this creature enters, each player sacrifices a nontoken creature of their choice."
Mazirek, Kraul Death Priest88%
$0.26↓#1585↑0.36↑10.8 years↑
"Whenever a player sacrifices another permanent, put a +1/+1 counter on each creature you control."
Chain Devil87%
$0.27↓#115840.28↑4.2 years↑
"When this creature enters, each player sacrifices a nontoken creature of their choice."
Wasteland Raider86%
$0.35↑#8174↑0.24↑2.5 years↑
"When this creature enters, each player sacrifices a creature of their choice."
Thraximundar86%
$0.79↑#8992↑0.84↑17.3 years↑
"Whenever a player sacrifices a creature, you may put a +1/+1 counter on this card."
+1 more matching line
Benalish Sleeper85%
$0.10↓#16202↓0.10↑4.0 years↑
"When this creature enters, if it was kicked, each player sacrifices a creature of their choice."
Legate Lanius, Caesar's Ace84%
$0.33↑#110140.68↑2.5 years↑
"Whenever an opponent sacrifices a creature, put a +1/+1 counter on this card."
+1 more matching line
Lokhust Heavy Destroyer83%
$0.42↑#112210.41↑3.9 years↑
"When this creature enters, each player sacrifices a creature of their choice."
Carmen, Cruel Skymarcher82%
$0.61↑#2799↑0.32↑2.8 years↑
"Whenever a player sacrifices a permanent, put a +1/+1 counter on this card and you gain 1 life."
Demon's Disciple82%
$0.27↓#2236↑0.39↑5.9 years↑
"When this creature enters, each player sacrifices a creature or planeswalker of their choice."
Bloodbriar82%
$0.04↓#19292↓0.25↑10.1 years↑
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Pirate Peddlers82%
$0.15↓#14840↓0.000.8 years
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Gixian Infiltrator82%
$0.29↓#16768↓0.003.8 years↑
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Zodiark, Umbral God80%
$0.80↑#4586↑0.68↑1.2 years
"Whenever a player sacrifices another creature, put a +1/+1 counter on this card."
+1 more matching line
Sawblade Skinripper80%
$0.18↓#14364↓0.22↑1.9 years↑
"Menace"