Rottenmouth Viper {5}{B}
Creature — Elemental Snake
As an additional cost to cast this spell, you may sacrifice any number of nonland permanents. This spell costs {1} less to cast for each permanent sacrificed this way.
Whenever this creature enters or attacks, put a blight counter on it. Then for each blight counter on it, each opponent loses 4 life unless that player sacrifices a nonland permanent of their choice or discards a card.
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Cards that do something similar 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.
Sigarda, Host of Herons 88%
$2.87#5919
"Spells and abilities your opponents control can't cause you to sacrifice permanents."
Tajuru Preserver 88%
$3.63#11104
"Spells and abilities your opponents control can't cause you to sacrifice permanents."
Dralnu, Lich Lord 87%
$0.28#19429
"If damage would be dealt to this card, sacrifice that many permanents instead."
Blighted Blackthorn 86%
$0.13#16537
"Whenever this creature enters or attacks, you may blight 2. If you do, you draw a card and lose 1 life."
Rite of Oblivion 86%
$0.41#3686
"As an additional cost to cast this spell, sacrifice a nonland permanent."
Fatal Grudge 86%
$0.18#11727
"As an additional cost to cast this spell, sacrifice a nonland permanent."
Phyrexian Totem 85%
$0.25#23770
"Whenever this permanent is dealt damage, if it's a creature, sacrifice that many permanents."