Sky Tether 
Enchantment — Aura
$0.07 #22662 0.30 7.7 years
Enchant creature
Enchanted creature has defender and loses flying.
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Cards similar to Sky Tether 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.
Zephyr Net90%
$0.26↑#29416↓0.07↓19.0 years↑
"Enchanted creature has defender and flying."
+1 more matching line
Guard Duty88%
$0.09↑#224190.2716.5 years↑
"Enchanted creature has defender."
+1 more matching line
Stasis Field87%
$0.18↑#13767↑0.393.5 years↓
"Enchanted creature has base power and toughness 0/2, has defender, and loses all other abilities."
Grounded86%
$0.04↓#29782↓0.06↓14.5 years↑
"Enchanted creature loses flying."
+1 more matching line
Candletrap86%
$0.24↑#17277↑0.44↑5.1 years↓
"Enchanted creature has defender."
Earthbind85%
$0.99↑#227900.50↑33.2 years↑
"Enchant creature"
Hold for Ransom79%
$0.16↑#197370.60↑4.5 years↓
"Enchant creature"
Fog on the Barrow-Downs79%
$0.11↑#182880.42↑3.3 years↓
"Enchant creature"
Spider-Man No More78%
$0.19↑#7883↑0.59↑1.1 years↓
"Enchanted creature is a Citizen with base power and toughness 1/1. It has defender and loses all other abilities."
Gelid Shackles78%
$0.28↑#17148↑0.2720.2 years↑
"Enchanted creature can't block, and its activated abilities can't be activated."
+1 more matching line
Deep Freeze77%
$0.21↑#183540.298.5 years
"Enchanted creature has base power and toughness 0/4, has defender, loses all other abilities, and is a blue Wall in addition to its other colors and types."
+1 more matching line
Mammoth Harness76%
$0.56↑#32041↓0.2031.1 years↑
"Enchanted creature loses flying."
+1 more matching line
Heliod's Punishment76%
$0.13↑#15344↑0.246.7 years
"Enchant creature"
Gravity Sphere74%
$52.37↑#250280.2432.4 years↑
"All creatures lose flying."
Tightening Coils72%
$0.06↓#256960.06↓11.0 years↑
"Enchanted creature gets -6/-0 and loses flying."
Archetype of Imagination72%
$0.92↑#1884↑0.49↑12.7 years↑
"Creatures your opponents control lose flying and can't have or gain flying."
Dog Umbra71%
$0.21↑#7182↑0.282.3 years↓
"Enchant creature"