Porphyry Nodes 
Enchantment
$0.28 #21553 0.58 19.6 years
At the beginning of your upkeep, destroy the creature with the least power. It can't be regenerated. If two or more creatures are tied for least power, you choose one of them.
When there are no creatures on the battlefield, sacrifice this enchantment.
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Drop of Honey100%
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"When there are no creatures on the battlefield, sacrifice this enchantment."
+1 more matching line
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"At the beginning of each player's upkeep, destroy target nonartifact creature that player controls of their choice. It can't be regenerated."
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"When you control no other creatures, sacrifice this creature."
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"When there are no creatures on the battlefield, sacrifice this enchantment."
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"When no creatures are on the battlefield, sacrifice this enchantment."
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"When there are no lands on the battlefield, sacrifice this enchantment."
Call to the Grave74%
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"At the beginning of the end step, if no creatures are on the battlefield, sacrifice this enchantment."
Visara the Dreadful74%
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"
: Destroy target creature. It can't be regenerated."
The Abyss73%
$698.70↑#214111.11↑32.3 years↑
"At the beginning of each player's upkeep, destroy target nonartifact creature that player controls of their choice. It can't be regenerated."
Dark Hatchling73%
$0.12↓#185020.38↓27.9 years↑
"When this creature enters, destroy target nonblack creature. It can't be regenerated."
Nekrataal72%
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"When this creature enters, destroy target nonartifact, nonblack creature. That creature can't be regenerated."
Seal of Doom72%
$0.12↓#9437↑0.5826.6 years↑
"Sacrifice this enchantment: Destroy target nonblack creature. It can't be regenerated."
Damn72%
$2.03↑#345↑0.36↓5.3 years↓
"Destroy target creature. A creature destroyed this way can't be regenerated."
Plague Wind71%
$2.50↑#6513↑0.46↓26.3 years↑
"Destroy all creatures you don't control. They can't be regenerated."
Notorious Assassin70%
$1.19↑#252800.32↓26.9 years↑
"
,
, Discard a card: Destroy target nonblack creature. It can't be regenerated."