Skulking Killer 

Creature — Vampire Assassin
$0.10 #25265 0.00 4.8 years
When this creature enters, target creature an opponent controls gets -2/-2 until end of turn if that opponent controls no other creatures.
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Cards similar to Skulking Killer expected a card that isn't here?
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"When this creature enters, target creature gets -2/-2 until end of turn."
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"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn."