Merchant of Venom 
Creature — Cat Warlock
$0.21 #10874 0.33 0.5 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%
$0.10↓#14789↓0.21↓14.0 years↑
"When this creature enters, each player sacrifices a creature of their choice."
Fleshbag Marauder92%
$0.17↓#795↑0.65↑18.0 years↑
"When this creature enters, each player sacrifices a creature of their choice."
Merciless Executioner92%
$0.37↑#2193↑0.3711.7 years↑
"When this creature enters, each player sacrifices a creature of their choice."
Abyssal Gorestalker90%
$0.24↑#14995↓1.00↑2.9 years↑
"When this creature enters, each player sacrifices two creatures of their choice."
Mortician Beetle90%
$1.65↑#101880.05↓16.5 years↑
"Whenever a player sacrifices a creature, you may put a +1/+1 counter on this creature."
Thraximundar90%
$0.83↑#92670.61↑17.5 years↑
"Whenever a player sacrifices a creature, you may put a +1/+1 counter on this card."
+1 more matching line
Accursed Marauder90%
$0.37↑#476↑0.72↑2.3 years↑
"When this creature enters, each player sacrifices a nontoken creature of their choice."
Mazirek, Kraul Death Priest88%
$0.29↑#1569↑0.44↑10.9 years↑
"Whenever a player sacrifices another permanent, put a +1/+1 counter on each creature you control."
Chain Devil87%
$0.25↑#118170.14↓4.4 years↑
"When this creature enters, each player sacrifices a nontoken creature of their choice."
Wasteland Raider85%
$0.39↑#8288↑0.79↑2.6 years↑
"When this creature enters, each player sacrifices a creature of their choice."
Benalish Sleeper85%
$0.10↓#16692↓0.284.1 years↑
"When this creature enters, if it was kicked, each player sacrifices a creature of their choice."
Lokhust Heavy Destroyer84%
$0.47↑#114830.00↓4.0 years↑
"When this creature enters, each player sacrifices a creature of their choice."
Legate Lanius, Caesar's Ace84%
$0.30↑#112820.13↓2.6 years↑
"Whenever an opponent sacrifices a creature, put a +1/+1 counter on this card."
+1 more matching line
Demon's Disciple82%
$0.28↑#2231↑0.296.1 years↑
"When this creature enters, each player sacrifices a creature or planeswalker of their choice."
Carmen, Cruel Skymarcher82%
$0.67↑#2875↑0.382.9 years↑
"Whenever a player sacrifices a permanent, put a +1/+1 counter on this card and you gain 1 life."
Bloodbriar82%
$0.04↓#19492↓0.21↓10.2 years↑
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Gixian Infiltrator82%
$0.25↑#17047↓0.00↓3.9 years↑
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Pirate Peddlers82%
$0.15↓#14647↓0.19↓0.9 years
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Zodiark, Umbral God80%
$0.55↑#4433↑1.08↑1.4 years
"Whenever a player sacrifices another creature, put a +1/+1 counter on this card."
+1 more matching line
Sawblade Skinripper80%
$0.19↓#14580↓0.242.1 years↑
"Menace"