Gravity Well 
Enchantment
$0.50 #13742 0.29 16.5 years
Whenever a creature with flying attacks, it loses flying until end of turn.
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Cards similar to Gravity Well 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.
Kinscaer Harpoonist88%
$0.09↓#31669↓0.00↓18.5 years↑
"Whenever this creature attacks, you may have target creature lose flying until end of turn."
Wind Shear87%
$0.21↓#30729↓0.06↓29.7 years↑
"Attacking creatures with flying get -2/-2 and lose flying until end of turn."
Gravity Sphere82%
$52.37↑#25028↓0.2432.4 years↑
"All creatures lose flying."
Radjan Spirit81%
$0.17↓#31559↓0.2032.4 years↑
"
: Target creature loses flying until end of turn."
: Target creature loses flying until end of turn."
Fear of Falling80%
$0.14↓#19347↓0.00↓2.1 years↓
"Whenever this creature attacks, target creature defending player controls gets -2/-0 and loses flying until your next turn."
Grounded80%
$0.04↓#29782↓0.06↓14.5 years↓
"Enchanted creature loses flying."
Raking Canopy80%
$1.54↑#16994↓0.07↓18.5 years↑
"Whenever a creature with flying attacks you, this enchantment deals 4 damage to it."
Vertigo78%
$0.12↓#31553↓0.00↓31.4 years↑
"this card deals 2 damage to target creature with flying. That creature loses flying until end of turn."
Adarkar Windform78%
$0.28↓#22856↓0.00↓20.2 years↑
"
: Target creature loses flying until end of turn."
: Target creature loses flying until end of turn."
Short Circuit74%
$0.10↓#25660↓0.05↓4.7 years↓
"As long as enchanted permanent is a creature, it gets -3/-0 and loses flying."
Canopy Claws74%
$0.33↓#27993↓0.05↓24.4 years↑
"Target creature loses flying until end of turn."
Archetype of Imagination73%
$0.92↑#1884↑0.49↑12.7 years↓
"Creatures your opponents control lose flying and can't have or gain flying."
Windreader Sphinx72%
$0.24↓#6648↑0.06↓13.3 years↓
"Whenever a creature with flying attacks, you may draw a card."
Femeref Archers72%
$0.19↓#22013↓0.06↓30.0 years↑
": This creature deals 4 damage to target attacking creature with flying."
: This creature deals 4 damage to target attacking creature with flying."
Burning Palm Efreet72%
$0.06↓#31909↓0.00↓30.0 years↑
"
: This creature deals 2 damage to target creature with flying and that creature loses flying until end of turn."
: This creature deals 2 damage to target creature with flying and that creature loses flying until end of turn."
Songstitcher70%
$0.19↓#29725↓0.13↓28.0 years↑
"
: Prevent all combat damage that would be dealt this turn by target attacking creature with flying."
: Prevent all combat damage that would be dealt this turn by target attacking creature with flying."
Mammoth Harness70%
$0.56↑#32041↓0.2031.1 years↑
"Enchanted creature loses flying."
Sky Tether70%
$0.07↓#22662↓0.307.7 years↓
"Enchanted creature has defender and loses flying."