Air Bladder 
Enchantment — Aura
$0.11 #27010 0.10 26.7 years
Enchant creature
Enchanted creature has flying.
Enchanted creature can block only creatures with flying.
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Cards similar to Air Bladder 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.
Stratus Walk96%
$0.03↓#21105↑0.0712.7 years↓
"Enchanted creature can block only creatures with flying."
+2 more matching lines
Arcane Flight88%
$0.13↑#13343↑0.23↑8.5 years↓
"Enchanted creature gets +1/+1 and has flying."
+1 more matching line
Spectral Flight88%
$0.16↑#19933↑0.0615.1 years↓
"Enchanted creature gets +2/+2 and has flying."
+1 more matching line
Dense Canopy86%
$0.25↑#235900.38↑21.4 years↓
"Creatures with flying can block only creatures with flying."
Chaosphere82%
$9.43↑#16706↑0.29↑30.0 years↑
"Creatures with flying can block only creatures with flying."
Drake Umbra81%
$0.19↑#15077↑0.1916.5 years↓
"Enchanted creature gets +3/+3 and has flying."
+1 more matching line
Call to Serve81%
$0.19↑#20836↑0.00↓14.5 years↓
"Enchanted creature gets +1/+2, has flying, and is an Angel in addition to its other types."
Wings of Aesthir80%
$0.25↑#298310.31↑31.4 years↑
"Enchanted creature gets +1/+0 and has flying and first strike."
+1 more matching line