Korvold, Gleeful Glutton {5}{B}{R}{G}
Legendary Creature — Dragon Noble
This spell costs {1} less to cast for each card type among permanents you've sacrificed this turn.
Flying, trample, haste
Whenever Korvold deals combat damage to a player, put X +1/+1 counters on Korvold and draw X cards, where X is the number of permanent types among cards in your graveyard.
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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 86%
$0.43#6509
"This spell costs {1} less to cast for each permanent sacrificed this turn."