Nightmare 
Creature — Nightmare Horse
$0.16 #14215 0.05 33.2 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↓#18406↓0.0012.5 years↓
"this card's power and toughness are each equal to the number of Swamps you control."
Sima Yi, Wei Field Marshal96%
$30.02↑#28523↓0.28↑27.5 years↓
"this card's power is equal to the number of Swamps you control."
Dakmor Sorceress96%
$0.32↑#24341↓0.1228.3 years↓
"this card's power is equal to the number of Swamps you control."
Korlash, Heir to Blackblade92%
$3.22↑#167330.1019.5 years↓
"this card's power and toughness are each equal to the number of Swamps you control."
Mirkwood Pathmaker92%
$0.16#151140.17↑0.2 years↓
"this card's power and toughness are each equal to the number of lands you control."
Molimo, Maro-Sorcerer92%
$0.23↑#121100.0726.0 years↓
"this card's power and toughness are each equal to the number of lands you control."
Swampbenders91%
$0.68↑#17238↓0.23↑0.9 years↓
"this card's power and toughness are each equal to the number of Swamps on the battlefield."
Dungrove Elder90%
$0.27↑#10849↑0.35↑15.3 years↓
"this card's power and toughness are each equal to the number of Forests you control."
Kalonian Twingrove90%
$0.47↑#126380.41↑12.3 years↓
"this card's power and toughness are each equal to the number of Forests you control."
Flora Colossus90%
$0.26↑#24964↓0.27↑0.3 years↓
"this card's power and toughness are each equal to the number of lands you control."
Dakkon Blackblade90%
$2.08↑#19305↓0.0532.4 years
"this card's power and toughness are each equal to the number of lands you control."
Drift of the Dead90%
$0.23↑#23900↓0.27↑31.4 years↓
"this card's power and toughness are each equal to the number of snow lands you control."
Harmonious Grovestrider88%
$0.18↑#150550.121.2 years↓
"this card's power and toughness are each equal to the number of lands you control."
Allosaurus Rider88%
$3.17↑#17366↓0.1220.3 years↓
"this card's power and toughness are each equal to 1 plus the number of lands you control."
Uktabi Wildcats87%
$0.45↑#24507↓0.0030.0 years↓
"this card's power and toughness are each equal to the number of Forests you control."
Rubblehulk87%
$0.22↑#135500.29↑13.7 years↓
"this card's power and toughness are each equal to the number of lands you control."
Zendikar Incarnate86%
$0.14↓#167200.0011.3 years↓
"this card's power is equal to the number of lands you control."
Cultivator Colossus86%
$5.17↑#1604↑0.69↑4.9 years↓
"this card's power and toughness are each equal to the number of lands you control."
Treefolk Seedlings86%
$0.36↑#20381↓0.23↑28.0 years↓
"this card's toughness is equal to the number of Forests you control."
People of the Woods86%
$1.09↑#30361↓0.0632.2 years
"this card's toughness is equal to the number of Forests you control."