Sky Tether 
Enchantment — Aura
$0.06 #22572 0.33 7.6 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%
$0.18↑#29012↓0.2918.9 years↑
"Enchanted creature has defender and flying."
Guard Duty88%
$0.08↑#224510.14↓16.4 years↑
"Enchanted creature has defender."
+1 more matching line
Stasis Field87%
$0.22↑#13414↑0.273.4 years↓
"Enchanted creature has base power and toughness 0/2, has defender, and loses all other abilities."
+1 more matching line
Grounded86%
$0.04↓#29486↓0.2914.3 years↑
"Enchanted creature loses flying."
Candletrap86%
$0.21↑#17162↑0.73↑4.9 years↓
"Enchanted creature has defender."
Brainwash80%
$0.12↑#221490.68↑32.1 years↑
"Enchant creature"
Spider-Man No More78%
$0.19↑#8123↑0.51↑1.0 years↓
"Enchanted creature is a Citizen with base power and toughness 1/1. It has defender and loses all other abilities."
Gelid Shackles78%
$0.30↑#16810↑0.06↓20.1 years↑
"Enchanted creature can't block, and its activated abilities can't be activated."
Revoke Privileges78%
$0.03↓#266000.07↓9.9 years↑
"Enchant creature"
Deep Freeze77%
$0.20↑#18039↑0.53↑8.4 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%
$0.52↑#31704↓0.2730.9 years↑
"Enchanted creature loses flying."
Heliod's Punishment76%
$0.14↑#15076↑0.07↓6.6 years
"Enchant creature"
Gravity Sphere74%
$53.46↑#248320.2732.3 years↑
"All creatures lose flying."
Tightening Coils72%
$0.06#256500.12↓10.9 years↑
"Enchanted creature gets -6/-0 and loses flying."
Archetype of Imagination72%
$0.62↑#1830↑0.59↑12.6 years↑
"Creatures your opponents control lose flying and can't have or gain flying."
Dog Umbra71%
$0.22↑#7066↑0.282.2 years↓
"Enchant creature"