Chaosphere 
World Enchantment
$9.24 #16551 0.38 29.9 years
Creatures with flying can block only creatures with flying.
Creatures without flying have reach. (They can block creatures with flying.)
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Cards similar to Chaosphere 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.
Dense Canopy98%
$0.22↓#23330↓0.56↑21.3 years↓
"Creatures with flying can block only creatures with flying."
Stratus Walk84%
$0.06↓#20884↓0.3612.6 years↓
"Enchanted creature can block only creatures with flying."
Air Bladder82%
$0.11↓#27021↓0.2826.6 years↓
"Enchanted creature can block only creatures with flying."
Spidersilk Armor78%
$0.87↓#7245↑0.27↓26.9 years↓
"Creatures you control get +0/+1 and have reach."
Crossbow Ambush76%
$0.15↓#25533↓0.00↓28.5 years↓
"Creatures you control gain reach until end of turn."
Bower Passage75%
$0.77↓#8549↑0.26↓14.3 years↓
"Creatures with flying can't block creatures you control."
Talruum Piper73%
$0.21↓#30512↓0.3529.6 years
"All creatures with flying able to block this creature do so."
Gnat Alley Creeper73%
$0.04↓#31913↓0.4420.3 years↓
"This creature can't be blocked by creatures with flying."
Skyscythe Engulfer73%
$0.17↓#191300.293.6 years↓
"This creature can't be blocked by creatures with flying."
Stone Spirit73%
$0.27↓#31830↓0.00↓31.3 years↑
"This creature can't be blocked by creatures with flying."
Spinneret Sliver72%
$0.32↓#11242↑0.73↑19.9 years↓
"All Sliver creatures have reach."
Frog Tongue72%
$0.20↓#145400.12↓28.9 years↓
"Enchanted creature has reach."
Geist Trappers71%
$0.05↓#30348↓0.4714.3 years↓
"As long as this creature is paired with another creature, both creatures have reach."
Assemble the Entmoot70%
$0.36↓#6789↑0.24↓3.2 years↓
"Creatures you control have reach."