Nightmare {5}{B}
Creature — Nightmare Horse
Flying (This creature can't be blocked except by creatures with flying or reach.)
Nightmare's power and toughness are each equal to the number of Swamps you 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.
Squelching Leeches 100%
$0.15#17777
"this card's power and toughness are each equal to the number of Swamps you control."
Korlash, Heir to Blackblade 100%
$3.35#16258
"this card's power and toughness are each equal to the number of Swamps you control."
Sima Yi, Wei Field Marshal 98%
$36.35#27995
"this card's power is equal to the number of Swamps you control."
Angry Mob 87%
#24407
"During your turn, this card's power and toughness are each equal to 2 plus the number of Swamps your opponents control. During turns other than yours, this card's power and toughness are each 2."
Swampbenders 85%
$1.01#18518
"this card's power and toughness are each equal to the number of Swamps on the battlefield."