Chittering Harvester 
Creature — Nightmare
$0.21 #8941 0.33 6.4 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."
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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
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$0.61↑#82970.12↓6.6 years
"Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice."
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"When this creature enters, you may have target opponent sacrifice a creature of their choice."
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"Target player sacrifices a creature of their choice."
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$0.21#6032↑0.61↑4.2 years↓
"Each opponent sacrifices a creature of their choice."
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"Whenever this creature or another creature you control dies, each opponent sacrifices a creature of their choice."
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"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."
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"Whenever a creature you control dies, each other player sacrifices a creature of their choice."
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"When this creature dies, each opponent sacrifices an artifact or creature of their choice."
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"Each opponent sacrifices a creature of their choice."
Barrensteppe Siege81%
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"• Mardu — At the beginning of your end step, if a creature died under your control this turn, each opponent sacrifices a creature of their choice."