Gravity Sphere 
World Enchantment
$52.37 #25028 0.24 32.4 years
All creatures lose flying.
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Cards similar to Gravity Sphere 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.
Grounded86%
$0.04↓#297820.06↓14.5 years↓
"Enchanted creature loses flying."
Mystic Decree85%
$0.97↓#253170.3231.1 years↓
"All creatures lose flying and islandwalk."
Whiteout84%
$0.28↓#251550.3331.4 years↓
"All creatures lose flying until end of turn."
Archetype of Imagination83%
$0.92↓#1884↑0.49↑12.7 years↓
"Creatures your opponents control lose flying and can't have or gain flying."
Gravity Well82%
$0.50↓#13742↑0.2916.5 years↓
"Whenever a creature with flying attacks, it loses flying until end of turn."
Thundercloud Elemental80%
$0.13↓#31044↓0.06↓23.4 years↓
"
: All other creatures lose flying until end of turn."
: All other creatures lose flying until end of turn."
Kinscaer Harpoonist80%
$0.09↓#31669↓0.00↓18.5 years↓
"Flying"
Canopy Claws78%
$0.33↓#279930.05↓24.4 years↓
"Target creature loses flying until end of turn."
Fear of Falling76%
$0.14↓#19347↑0.00↓2.1 years↓
"Flying"
Mammoth Harness76%
$0.56↓#32041↓0.2031.1 years↓
"Enchanted creature loses flying."
Sky Tether74%
$0.07↓#226620.307.7 years↓
"Enchanted creature has defender and loses flying."
Downdraft72%
$0.27↓#282720.00↓29.4 years↓
"Sacrifice this enchantment: It deals 2 damage to each creature with flying."
Emerald Charm70%
$0.16↓#5922↑0.00↓29.7 years↓
"• Target creature loses flying until end of turn."