Nightmare Lash 
Artifact — Equipment
$8.74 #11118 0.06 23.0 years
Equipped creature gets +1/+1 for each Swamp you control.
Equip—Pay 3 life. (Pay 3 life: Attach to target creature you control. Equip only as a sorcery.)
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Cards similar to Nightmare Lash 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.
Blackblade Reforged88%
$2.97↓#357↑0.34↑8.5 years↓
"Equipped creature gets +1/+1 for each land you control."
Lashwrithe86%
$0.66↓#8126↑0.22↑15.4 years↓
"Equipped creature gets +1/+1 for each Swamp you control."
Dark Knight's Greatsword86%
$0.24↓#118490.061.4 years↓
"Equip—Pay 3 life. Activate only once each turn."
Hand of Vecna78%
$0.37↓#97400.125.2 years↓
"Equip—Pay 1 life for each card in your hand."
+1 more matching line
Staff of Titania76%
$5.19↓#4370↑0.36↑3.9 years↓
"Equipped creature gets +X/+X, where X is the number of Forests you control."
Sigil of Distinction76%
$1.80↓#14194↓0.1218.0 years↓
"Equipped creature gets +1/+1 for each charge counter on this Equipment."
Sima Yi, Wei Field Marshal75%
$30.02↑#28523↓0.28↑27.5 years↑
"this card's power is equal to the number of Swamps you control."
Dakmor Sorceress75%
$0.32↓#24341↓0.1228.3 years↑
"this card's power is equal to the number of Swamps you control."
Squelching Leeches74%
$0.12↓#18406↓0.0012.5 years↓
"this card's power and toughness are each equal to the number of Swamps you control."
Nightmare74%
$0.16↓#14215↓0.0533.2 years↑
"this card's power and toughness are each equal to the number of Swamps you control."
Mire Kavu73%
$0.06↓#31254↓0.25↑25.7 years↑
"This creature gets +1/+1 as long as you control a Swamp."
Blanchwood Armor72%
$0.16↓#3076↑0.1228.0 years↑
"Enchanted creature gets +1/+1 for each Forest you control."
Gavel of the Righteous71%
$0.27↓#5203↑0.004.5 years↓
"Equipped creature gets +1/+1 for each counter on this Equipment."
Granite Grip70%
$0.12↓#14803↓0.55↑27.7 years↑
"Enchanted creature gets +1/+0 for each Mountain you control."
Demonmail Hauberk70%
$0.17↓#14806↓0.0615.1 years↓
"Equipped creature gets +4/+2."
Earth Servant70%
$0.08↓#26654↓0.0016.3 years↓
"This creature gets +0/+1 for each Mountain you control."