Souls of the Lost {1}{B}
Creature — Spirit
As an additional cost to cast this spell, discard a card or sacrifice a permanent.
Fathomless descent — Souls of the Lost's power is equal to the number of permanent cards in your graveyard and its toughness is equal to that number plus 1.
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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.
Exdeath, Void Warlock // Neo Exdeath, Dimension's End 83%
$0.24#12320
"Neo this card's power is equal to the number of permanent cards in your graveyard."
Consuming Blob 81%
$0.44#13096
"this card's power is equal to the number of card types among cards in your graveyard and its toughness is equal to that number plus 1."