Sphere of Reason 
Enchantment
$0.24 #30158 0.16 25.1 years
If a blue source would deal damage to you, prevent 2 of that damage.
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Cards similar to Sphere of Reason 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.
Circle of Protection: Blue92%
$0.09↓#22047↑0.27↑33.2 years↑
"
: The next time a blue source of your choice would deal damage to you this turn, prevent that damage."
: The next time a blue source of your choice would deal damage to you this turn, prevent that damage."
Protection of the Hekma88%
$0.25↑#260850.47↑9.5 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Guardian Seraph88%
$0.61↑#21183↑0.1817.3 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Sphere of Grace88%
$0.27↑#290030.38↑25.1 years
"If a black source would deal damage to you, prevent 2 of that damage."
Sphere of Truth87%
$0.27↑#301110.05↓25.1 years
"If a white source would deal damage to you, prevent 2 of that damage."
Sphere of Law86%
$0.62↑#278970.32↑25.1 years
"If a red source would deal damage to you, prevent 2 of that damage."
Sphere of Duty84%
$0.19↓#290540.1125.1 years
"If a green source would deal damage to you, prevent 2 of that damage."
Rune of Protection: Blue84%
$0.18↓#254080.41↑28.0 years↑
": The next time a blue source of your choice would deal damage to you this turn, prevent that damage."
: The next time a blue source of your choice would deal damage to you this turn, prevent that damage."
Urza's Armor82%
$0.24#20775↑0.00↓28.0 years↑
"If a source would deal damage to you, prevent 1 of that damage."
Orbs of Warding80%
$0.67↑#13293↑0.2511.3 years↓
"If a creature would deal damage to you, prevent 1 of that damage."
Hedron-Field Purists78%
$0.36↑#22676↑0.00↓16.5 years↓
"If a source would deal damage to you or a creature you control, prevent 2 of that damage."
Sphere of Purity77%
$0.02↓#308170.05↓23.0 years↓
"If an artifact would deal damage to you, prevent 1 of that damage."
Plated Pegasus75%
$0.30↑#22267↑0.06↓20.0 years↓
"If a spell would deal damage to a permanent or player, prevent 1 damage that spell would deal to that permanent or player."
Circle of Protection: Black74%
$0.09↓#20837↑0.06↓33.0 years↑
": The next time a black source of your choice would deal damage to you this turn, prevent that damage."
: The next time a black source of your choice would deal damage to you this turn, prevent that damage."
Gainsay74%
$0.07↓#242430.0725.7 years
"Counter target blue spell."
Circle of Protection: White72%
$0.11↓#19318↑0.38↑33.2 years↑
": The next time a white source of your choice would deal damage to you this turn, prevent that damage."
: The next time a white source of your choice would deal damage to you this turn, prevent that damage."
Mudbrawler Raiders72%
$0.21↓#314750.1118.5 years↓
"This creature can't be blocked by blue creatures."
Karoo Meerkat72%
$0.16↓#305280.2530.0 years↑
"Protection from blue"
Guma72%
$0.28↑#301480.00↓28.0 years↑
"Protection from blue"
Nacatl Outlander72%
$0.13↓#282180.00↓17.7 years↓
"Protection from blue"