Massacre Wurm 
Creature — Phyrexian Wurm
$1.94 #514 0.88 15.7 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."
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"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."
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"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
Archfiend of the Dross86%
$0.36↓#6853↓0.44↓3.7 years↓
"Whenever a creature an opponent controls dies, its controller loses 2 life."
Foundry Hornet84%
$0.21↓#25736↓0.06↓9.7 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."
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$0.07↓#26587↓0.11↓11.6 years↓
"When this creature exploits a creature, creatures your opponents control get -1/-1 until end of turn."
Archfiend of Sorrows82%
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"When this creature enters, creatures your opponents control get -2/-2 until end of turn."
Suffocating Fumes82%
$0.20↓#15331↓0.06↓6.5 years↓
"Creatures your opponents control get -1/-1 until end of turn."
Seeker's Folly82%
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"• Creatures your opponents control get -1/-1 until end of turn."
Shrouded Shepherd // Cleave Shadows80%
$0.18↓#23763↓0.00↓3.1 years↓
"Creatures your opponents control get -1/-1 until end of turn."
Gruesome Realization80%
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"• 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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$0.71↓#9255↓0.8615.1 years
"Creatures enchanted player controls get -1/-1."
Let's Play a Game79%
$0.20↓#9493↓0.19↓2.1 years↓
"• Creatures your opponents control get -1/-1 until end of turn."
Gimli, Counter of Kills79%
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"Whenever a creature an opponent controls dies, this card deals 1 damage to that creature's controller."