Gnawing Vermin 
Creature — Rat
When this creature enters, target player mills two cards.
When this creature dies, target creature you don't control gets -1/-1 until end of turn.
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Cards that do something similar expected a card that isn't here?
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Watcher of the Wayside 95%
$0.21#15963
"When this creature enters, target player mills two cards. You gain 2 life."
Undead Executioner 88%
$0.07#29441
"When this creature dies, you may have target creature get -2/-2 until end of turn."
Raffine's Silencer 88%
$0.22#16195
"When this creature dies, target creature an opponent controls gets -X/-X until end of turn, where X is this creature's power."
Slaughterhouse Bouncer 88%
$0.03#30740
"When this creature dies, if you have no cards in hand, target creature gets -3/-3 until end of turn."
Splatter Goblin 88%
$0.12#25311
"When this creature dies, target creature an opponent controls gets -1/-1 until end of turn."
Shambling Goblin 88%
$0.17#21058
"When this creature dies, target creature an opponent controls gets -1/-1 until end of turn."
Grim Physician 88%
$0.18#21871
"When this creature dies, target creature an opponent controls gets -1/-1 until end of turn."
Festering Goblin 87%
$0.13#18383
"When this creature dies, target creature gets -1/-1 until end of turn."
Festering Newt 85%
$0.14#21340
"When this creature dies, target creature an opponent controls gets -1/-1 until end of turn. That creature gets -4/-4 instead if you control a creature named Bogbrew Witch."
Loathsome Catoblepas 84%
$0.02#31491
"When this creature dies, target creature an opponent controls gets -3/-3 until end of turn."
Disease Carriers 84%
$0.13#25356
"When this creature dies, target creature gets -2/-2 until end of turn."
Hornet Harasser 84%
$0.12#28891
"When this creature dies, target creature gets -2/-2 until end of turn."