Nightmare 
Creature — Nightmare Horse
$0.15 #14070 0.31 33.1 years
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 similar to Nightmare 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 Leeches100%
$0.12↓#18084↓0.50↑12.4 years↓
"this card's power and toughness are each equal to the number of Swamps you control."
Sima Yi, Wei Field Marshal96%
$30.02↑#28337↓0.3827.3 years↓
"this card's power is equal to the number of Swamps you control."
Dakmor Sorceress96%
$0.30↑#24131↓0.3328.2 years↓
"this card's power is equal to the number of Swamps you control."
Swampbenders92%
$0.39↑#17639↓0.00↓0.8 years↓
"this card's power and toughness are each equal to the number of Swamps on the battlefield."
Korlash, Heir to Blackblade91%
$3.17↑#165240.2219.4 years↓
"this card's power and toughness are each equal to the number of Swamps you control."
Dungrove Elder91%
$0.78↑#11139↑0.2915.1 years↓
"this card's power and toughness are each equal to the number of Forests you control."
Kalonian Twingrove90%
$0.47↑#124120.3512.1 years↓
"this card's power and toughness are each equal to the number of Forests you control."
Drift of the Dead90%
$0.23↑#23693↓0.2931.3 years↓
"this card's power and toughness are each equal to the number of snow lands you control."
Mirkwood Pathmaker90%
$0.20↑#18300↓0.00↓0.1 years↓
"this card's power and toughness are each equal to the number of lands you control."
Flora Colossus90%
$0.19↑#26480↓0.00↓0.2 years↓
"this card's power and toughness are each equal to the number of lands you control."
Molimo, Maro-Sorcerer90%
$0.17↑#117430.3325.9 years↓
"this card's power and toughness are each equal to the number of lands you control."
Dakkon Blackblade88%
$2.04↑#19018↓0.3632.3 years
"this card's power and toughness are each equal to the number of lands you control."
Uktabi Wildcats86%
$0.50↑#24175↓0.58↑29.9 years↓
"this card's power and toughness are each equal to the number of Forests you control."
Harmonious Grovestrider86%
$0.16↑#150710.18↓1.1 years↓
"this card's power and toughness are each equal to the number of lands you control."
Treefolk Seedlings85%
$0.35↑#20039↓0.17↓27.9 years↓
"this card's toughness is equal to the number of Forests you control."
People of the Woods85%
$1.06↑#30095↓0.3832.1 years
"this card's toughness is equal to the number of Forests you control."
Allosaurus Rider85%
$3.15↑#17100↓0.3720.2 years↓
"this card's power and toughness are each equal to 1 plus the number of lands you control."
Awakened Amalgam85%
$0.26↑#19785↓0.12↓8.6 years↓
"this card's power and toughness are each equal to the number of differently named lands you control."
Matca Rioters85%
$0.10↓#28969↓0.05↓17.6 years↓
"this card's power and toughness are each equal to the number of basic land types among lands you control."
Territorial Maro84%
$0.10↓#24245↓0.00↓4.0 years↓
"this card's power and toughness are each equal to twice the number of basic land types among lands you control."