Count Nefaria {6}{B}
Legendary Creature — Human Villain
This spell costs {3} less to cast if you've sacrificed a permanent this turn.
Flying
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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.
The Balrog, Durin's Bane 87%
$0.43#6509
"This spell costs {1} less to cast for each permanent sacrificed this turn."
Gigastorm Titan 87%
$0.12#23676
"This spell costs {3} less to cast if you've cast another spell this turn."
Focus the Mind 84%
$0.24#9855
"This spell costs {2} less to cast if you've cast another spell this turn."
Rally the Monastery 84%
$0.25#12529
"This spell costs {2} less to cast if you've cast another spell this turn."
Thrasta, Tempest's Roar 83%
$0.66#9357
"This spell costs {3} less to cast for each other spell cast this turn."
Terrific Team-Up 83%
$0.21#13129
"This spell costs {2} less to cast if you control a permanent with mana value 4 or greater."
Temporal Intervention 83%
$0.10#19253
"This spell costs {2} less to cast if a nonland permanent left the battlefield this turn or a spell was warped this turn."
Suspicious Detonation 82%
$0.08#22917
"This spell costs {3} less to cast if you've sacrificed an artifact this turn."