Deathbringer Regent 
Creature — Dragon
$0.30 #7387 1.05 11.4 years
Flying
When this creature enters, if you cast it from your hand and there are five or more other creatures on the battlefield, destroy all other creatures.
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Cards similar to Deathbringer Regent expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
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"Choose up to one creature. Destroy the rest."
Planar Collapse78%
$0.43↑#17843↓0.47↓27.6 years↑
"At the beginning of your upkeep, if there are four or more creatures on the battlefield, sacrifice this enchantment and destroy all creatures. They can't be regenerated."
No Witnesses78%
$0.19↓#13032↓0.14↓2.6 years↓
"Each player who controls the most creatures investigates. Then destroy all creatures."
Day of Judgment78%
$0.63↑#1934↑0.49↓16.9 years↑
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"Destroy all creatures."
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"Flying"
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$0.08↓#29974↓0.43↓5.9 years↓
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$0.10↓#23935↓0.40↓11.4 years
"Flying"
Millennial Gargoyle78%
$0.09↓#29272↓0.00↓13.6 years↑
"Flying"
Enforcer Griffin78%
$0.07↓#27521↓0.00↓7.3 years↓
"Flying"
Colorful Feiyi Sparrow78%
$0.24↓#27825↓0.27↓8.2 years↓
"Flying"
Tormented Angel78%
$0.14↓#28488↓0.00↓27.2 years↑
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$0.11↓#29330↓0.07↓18.3 years↑
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Ascended Lawmage78%
$0.05↓#25653↓0.21↓13.3 years↑
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$0.05↓#26924↓0.00↓12.1 years
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