Dralnu, Lich Lord {3}{U}{B}
Legendary Creature — Zombie Wizard
If damage would be dealt to Dralnu, sacrifice that many permanents instead.
{T}: Target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)
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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 87%
$2.87#5919
"Spells and abilities your opponents control can't cause you to sacrifice permanents."
Tajuru Preserver 87%
$3.63#11104
"Spells and abilities your opponents control can't cause you to sacrifice permanents."
Rottenmouth Viper 87%
$5.48#2801
"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."
Phyrexian Totem 83%
$0.25#23770
"Whenever this permanent is dealt damage, if it's a creature, sacrifice that many permanents."