Massacre Wurm 
Creature — Phyrexian Wurm
$1.69 #512 0.80 15.6 years
When this creature enters, creatures your opponents control get -2/-2 until end of turn.
Whenever a creature an opponent controls dies, that player loses 2 life.
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"When this card enters, creatures your opponents control get -2/-2 until end of turn."
+1 more matching line
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"Creatures your opponents control get -1/-1 until end of turn."
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"Whenever a creature you control dies, each opponent loses 1 life."
+1 more matching line
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"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
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"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
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"Creatures target player controls get -2/-2 until end of turn."
Archfiend of the Dross86%
$0.37↓#6777↓0.33↓3.6 years↓
"Whenever a creature an opponent controls dies, its controller loses 2 life."
Foundry Hornet84%
$0.25↓#25395↓0.33↓9.6 years↓
"When this creature enters, if you control a creature with a +1/+1 counter on it, creatures your opponents control get -1/-1 until end of turn."
Minister of Pain84%
$0.13↓#26067↓0.07↓11.4 years↓
"When this creature exploits a creature, creatures your opponents control get -1/-1 until end of turn."
Suffocating Fumes84%
$0.20↓#14895↓0.43↓6.4 years↓
"Creatures your opponents control get -1/-1 until end of turn."
Seeker's Folly82%
$0.12↓#14322↓0.21↓1.8 years↓
"• Creatures your opponents control get -1/-1 until end of turn."
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$0.09↓#15000↓0.63↓5.2 years↓
"When this creature enters, creatures your opponents control get -2/-2 until end of turn."
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$0.19↓#23328↓0.00↓3.0 years↓
"Creatures your opponents control get -1/-1 until end of turn."
Gruesome Realization80%
$0.23↓#10254↓0.00↓3.8 years↓
"• Creatures your opponents control get -1/-1 until end of turn."
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"• Creatures target player controls get -1/-1 until end of turn."
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$0.92↓#9111↓0.51↓14.9 years
"Creatures enchanted player controls get -1/-1."
Let's Play a Game79%
$0.26↓#9293↓0.20↓1.9 years↓
"• Creatures your opponents control get -1/-1 until end of turn."
Wail of War79%
$0.15↓#14377↓0.21↓1.4 years↓
"• Creatures target opponent controls get -1/-1 until end of turn."