Virulent Silencer 
Artifact Creature — Robot Assassin
$0.26 #7285 1.00 1.2 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%
$0.17↓#2731↑1.31↑5.7 years↑
"Whenever a creature you control with deathtouch deals combat damage to a player, that player gets two poison counters."
Pit Scorpion78%
$0.08↓#27870↓0.31↓32.4 years↑
"Whenever this creature deals damage to a player, that player gets a poison counter."
Marsh Viper75%
$0.08↓#23235↓0.59↓32.2 years↑
"Whenever this creature deals damage to a player, that player gets two poison counters."
Necrogen Rotpriest74%
$0.19↓#70360.63↓3.7 years↑
"Whenever a creature you control with toxic deals combat damage to a player, that player gets an additional poison counter."
Phyrexian Vatmother73%
$0.41↑#13699↓0.32↓15.7 years↑
"At the beginning of your upkeep, you get a poison counter."
Reaper of Sheoldred71%
$0.81↑#11897↓0.76↓15.4 years↑
"Whenever a source deals damage to this creature, that source's controller gets a poison counter."