Blister Beetle 

Creature — Insect
When this creature enters, target creature 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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Keening Banshee 96%
$0.27#26780
"When this creature enters, target creature gets -2/-2 until end of turn."
Farbog Boneflinger 96%
$0.04#30279
"When this creature enters, target creature gets -2/-2 until end of turn."
Morkrut Banshee 93%
$0.12#24735
"When this creature enters, if a creature died this turn, target creature gets -4/-4 until end of turn."
Fourth Bridge Prowler 87%
$0.18#14105
"When this creature enters, you may have target creature get -1/-1 until end of turn."
Nivix Barrier 87%
$0.09#25422
"When this creature enters, target attacking creature gets -4/-0 until end of turn."
Zulaport Duelist 85%
$0.16#21900
"When this creature enters, up to one target creature gets -2/-0 until end of turn. Its controller mills two cards."
Gumdrop Poisoner // Tempt with Treats 85%
$0.28#11951
"When this creature enters, up to one target creature gets -X/-X until end of turn, where X is the amount of life you gained this turn."
Death Match 81%
$0.68#22864
"Whenever a creature enters, that creature's controller may have target creature of their choice get -3/-3 until end of turn."
Ubul Sar Gatekeepers 81%
$0.08#25580
"When this creature enters, if you control two or more Gates, target creature an opponent controls gets -2/-2 until end of turn."