Skulking Killer 

Creature — Vampire Assassin
$0.03 #25620 0.06 4.9 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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"When this creature enters, target creature gets -2/-2 until end of turn."
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"When this creature enters, target creature gets -1/-1 until end of turn."
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"When this creature enters, you may have target creature get -1/-1 until end of turn."
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"When this creature enters, target creature gets -2/-2 until end of turn."
Ambush Gigapede96%
$0.15↑#207350.062.5 years↓
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn."
Cultbrand Cinder91%
$0.11↑#306590.0018.5 years↑
"When this creature enters, put a -1/-1 counter on target creature."
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"When this creature enters, put three -1/-1 counters on target creature."
Weed-Pruner Poplar90%
$0.14↑#267500.1218.7 years↑
"At the beginning of your upkeep, target creature other than this creature gets -1/-1 until end of turn."