Chaosphere 

World Enchantment
Creatures with flying can block only creatures with flying.
Creatures without flying have reach. (They can block creatures with flying.)
click a line to search just that ability, click more to combine them
Cards that do something similar 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.
Ascending Aven 87%
$0.04#31072
"This creature can block only creatures with flying."
+1 more matching line
Etherium Pteramander 87%
$0.19#15391
"This creature can block only creatures with flying."
+1 more matching line
Battlefield Percher 87%
$0.15#31504
"This creature can block only creatures with flying."
+1 more matching line
Cloud Sprite 87%
$0.14#20849
"This creature can block only creatures with flying."
+1 more matching line
Vaporkin 87%
$0.04#29629
"This creature can block only creatures with flying."
+1 more matching line
Devoted Grafkeeper // Departed Soulkeeper 87%
$0.15#25709
"This creature can block only creatures with flying."