Virulent Silencer 
Artifact Creature — Robot Assassin
$0.30 #7457 0.58 1.1 years
Whenever a nontoken artifact creature you control deals combat damage to a player, that player gets two poison counters. (A player with ten or more poison counters loses the game.)
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Cards similar to Virulent Silencer 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.
Fynn, the Fangbearer87%
$0.18↓#2706↑1.15↑5.6 years↑
"Whenever a creature you control with deathtouch deals combat damage to a player, that player gets two poison counters."
Pit Scorpion78%
$0.09↓#28515↓0.86↑32.3 years↑
"Whenever this creature deals damage to a player, that player gets a poison counter."
Necrogen Rotpriest75%
$0.18↓#69120.71↑3.6 years↑
"Whenever a creature you control with toxic deals combat damage to a player, that player gets an additional poison counter."
Marsh Viper75%
$0.09↓#22925↓0.42↓32.1 years↑
"Whenever this creature deals damage to a player, that player gets two poison counters."
Phyrexian Vatmother73%
$0.38↑#13845↓0.5015.6 years↑
"At the beginning of your upkeep, you get a poison counter."
Reaper of Sheoldred71%
$0.89↑#12229↓0.6115.3 years↑
"Whenever a source deals damage to this creature, that source's controller gets a poison counter."