Sphere of Reason 
Enchantment
$0.24 #29770 0.36 24.9 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: Blue90%
$0.09↓#21834↑0.47↑33.1 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 Hekma90%
$0.18↓#258650.00↓9.4 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Guardian Seraph90%
$0.55↑#20983↑0.4217.1 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Rune of Protection: Blue87%
$0.19↓#250580.47↑27.9 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."
Sphere of Grace87%
$0.25↑#287050.4324.9 years
"If a black source would deal damage to you, prevent 2 of that damage."
Sphere of Truth86%
$0.30↑#297560.00↓24.9 years
"If a white source would deal damage to you, prevent 2 of that damage."
Sphere of Law86%
$0.61↑#275880.53↑24.9 years
"If a red source would deal damage to you, prevent 2 of that damage."
Urza's Armor85%
$0.24#20570↑0.2827.9 years↑
"If a source would deal damage to you, prevent 1 of that damage."
Hedron-Field Purists83%
$0.36↑#22327↑0.3116.4 years↓
"If a source would deal damage to you or a creature you control, prevent 2 of that damage."
Sphere of Duty83%
$0.21↓#286360.12↓24.9 years
"If a green source would deal damage to you, prevent 2 of that damage."
Orbs of Warding82%
$0.56↑#13137↑0.06↓11.1 years↓
"If a creature would deal damage to you, prevent 1 of that damage."
Sphere of Purity80%
$0.02↓#305610.4222.9 years↓
"If an artifact would deal damage to you, prevent 1 of that damage."
Plated Pegasus78%
$0.34↑#22182↑0.3119.9 years↓
"If a spell would deal damage to a permanent or player, prevent 1 damage that spell would deal to that permanent or player."
Nacatl Outlander76%
$0.10↓#279450.19↓17.6 years↓
"Protection from blue"
Guma76%
$0.26↑#299060.63↑27.9 years↑
"Protection from blue"
Karoo Meerkat76%
$0.17↓#301080.2929.9 years↑
"Protection from blue"
Yavimaya Barbarian76%
$0.08↓#294980.07↓25.9 years
"Protection from blue"
Mudbrawler Raiders74%
$0.07↓#311280.06↓18.3 years↓
"This creature can't be blocked by blue creatures."
Personal Sanctuary74%
$0.29↑#22903↑0.57↑15.1 years↓
"During your turn, prevent all damage that would be dealt to you."
Windreaper Falcon74%
$0.22↓#313750.2929.9 years↑
"Flying, protection from blue"