Chittering Harvester 
Creature — Nightmare
$0.21 #9105 0.20 6.5 years
Mutate 
(If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
(If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)Whenever this creature mutates, each opponent sacrifices a creature of their choice.
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Cards similar to Chittering Harvester 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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"When this card enters, each opponent sacrifices a creature of their choice."
Oath of Liliana89%
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"When this card enters, each opponent sacrifices a creature of their choice."
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"Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice."
+1 more matching line
Goremand84%
$0.18↓#14112↓0.41↑6.3 years
"When this creature enters, each opponent sacrifices a creature."
Agent of the Fates84%
$0.22↑#14964↓0.70↑13.1 years↑
"Whenever you cast a spell that targets this creature, each opponent sacrifices a creature of their choice."
Porcuparrot84%
$0.24↑#13933↓0.226.5 years
"Mutate 
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
Mire in Misery84%
$0.60↑#6530↑0.56↑7.2 years
"Each opponent sacrifices a creature or enchantment of their choice."
Demon of Loathing82%
$0.68↑#84000.88↑6.7 years
"Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice."
Far // Away82%
$0.18↓#16604↓0.1113.5 years↑
"Target player sacrifices a creature of their choice."
Myrkul's Edict82%
$0.22↑#6149↑0.50↑4.4 years↓
"Each opponent sacrifices a creature of their choice."
Butcher of Malakir82%
$0.31↑#1391↑1.02↑16.7 years↑
"Whenever this creature or another creature you control dies, each opponent sacrifices a creature of their choice."
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$0.07↓#31336↓0.41↑28.3 years↑
"When this creature enters, you may have target opponent sacrifice a creature of their choice."
Ashling, the Extinguisher81%
$28.66↑#13834↓0.50↑18.2 years↑
"Whenever this card deals combat damage to a player, choose target creature that player controls. The player sacrifices that creature."
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"Whenever a creature you control dies, each opponent sacrifices a creature of their choice."
Grave Pact80%
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"Whenever a creature you control dies, each other player sacrifices a creature of their choice."
Pyretic Prankster // Glistening Goremonger80%
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"When this creature dies, each opponent sacrifices an artifact or creature of their choice."
Huntmaster Liger80%
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"Mutate 
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
Sheoldred, Whispering One80%
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"At the beginning of each opponent's upkeep, that player sacrifices a creature of their choice."
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"Each opponent sacrifices a creature of their choice."