Witch-king, Bringer of Ruin {4}{B}{B}
Legendary Creature — Wraith Noble
Flying
Whenever Witch-king attacks, defending player sacrifices a creature with the least power among creatures they control.
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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.
Nefarox, Overlord of Grixis 90%
$0.41#17257
"Whenever this card attacks alone, defending player sacrifices a creature of their choice."
Thraximundar 85%
$1.39#8640
"Whenever this card attacks, defending player sacrifices a creature of their choice."
The Meep 84%
$29.88#19203
"Whenever this card attacks, you may sacrifice another creature. If you do, creatures you control have base power and toughness X/X until end of turn, where X is the sacrificed creature's mana value."
Ashnod, Flesh Mechanist 82%
$0.32#11334
"Whenever this card attacks, you may sacrifice another creature. If you do, create a tapped Powerstone token."
Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel 80%
$31.56#1345
"Whenever this card attacks, you may sacrifice any number of other creatures. If you do, draw that many cards."