Chaosphere 
World Enchantment
$9.43 #16706 0.29 30.0 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%
$0.25↓#23590↓0.3821.4 years↓
"Creatures with flying can block only creatures with flying."
Stratus Walk84%
$0.03↓#21105↓0.07↓12.7 years↓
"Enchanted creature can block only creatures with flying."
Air Bladder82%
$0.11↓#27010↓0.10↓26.7 years↓
"Enchanted creature can block only creatures with flying."
Spidersilk Armor78%
$0.94↓#7252↑0.3527.0 years↓
"Creatures you control get +0/+1 and have reach."
Crossbow Ambush76%
$0.12↓#25677↓0.2628.6 years↓
"Creatures you control gain reach until end of turn."
Bower Passage75%
$0.66↓#8782↑0.3514.5 years↓
"Creatures with flying can't block creatures you control."
Talruum Piper73%
$0.24↓#30764↓0.14↓29.7 years
"All creatures with flying able to block this creature do so."
Stone Spirit73%
$0.25↓#32152↓0.00↓31.4 years↑
"This creature can't be blocked by creatures with flying."
Gnat Alley Creeper73%
$0.10↓#32197↓0.06↓20.5 years↓
"This creature can't be blocked by creatures with flying."
Skyscythe Engulfer73%
$0.16↓#195500.00↓3.7 years↓
"This creature can't be blocked by creatures with flying."
Frog Tongue72%
$0.16↓#148440.2929.0 years↓
"Enchanted creature has reach."
Geist Trappers71%
$0.06↓#30680↓0.00↓14.5 years↓
"As long as this creature is paired with another creature, both creatures have reach."
Assemble the Entmoot70%
$0.48↓#6834↑0.333.3 years↓
"Creatures you control have reach."
Spinneret Sliver70%
$0.30↓#11296↑0.2120.0 years↓
"All Sliver creatures have reach."