Sphere of Grace 
Enchantment
$0.25 #28705 0.43 24.9 years
If a black source would deal damage to you, prevent 2 of that damage.
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Cards similar to Sphere of Grace 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: Black90%
$0.09↓#20657↑0.30↓32.9 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."
Sphere of Law88%
$0.61↑#275880.53↑24.9 years
"If a red source would deal damage to you, prevent 2 of that damage."
Rune of Protection: Black87%
$0.25#239700.00↓27.9 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."
Sphere of Reason87%
$0.24↓#297700.3624.9 years
"If a blue source would deal damage to you, prevent 2 of that damage."
Guardian Seraph86%
$0.55↑#20983↑0.4217.1 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Protection of the Hekma86%
$0.18↓#258650.00↓9.4 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Sphere of Truth84%
$0.30↑#297560.00↓24.9 years
"If a white source would deal damage to you, prevent 2 of that damage."
Shadowbane84%
$0.23↓#301890.53↑29.9 years↑
"The next time a source of your choice would deal damage to you and/or creatures you control this turn, prevent that damage. If damage from a black source is prevented this way, you gain that much life."
Sphere of Duty84%
$0.21↓#286360.12↓24.9 years
"If a green source would deal damage to you, prevent 2 of that damage."
Urza's Armor82%
$0.24↓#20570↑0.28↓27.9 years↑
"If a source would deal damage to you, prevent 1 of that damage."
Orbs of Warding80%
$0.56↑#13137↑0.06↓11.1 years↓
"If a creature would deal damage to you, prevent 1 of that damage."
Hedron-Field Purists80%
$0.36↑#22327↑0.31↓16.4 years↓
"If a source would deal damage to you or a creature you control, prevent 2 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."
Valeron Outlander78%
$0.05↓#310840.00↓17.6 years↓
"Protection from black"
Scalebane's Elite78%
$0.26↑#319400.20↓29.6 years↑
"Protection from black"
Llanowar Knight78%
$0.15↓#300130.13↓25.9 years
"Protection from black"
Death Speakers78%
$0.16↓#294560.4030.9 years↑
"Protection from black"
Raven's Run Dragoon78%
$0.11↓#314640.25↓18.3 years↓
"This creature can't be blocked by black creatures."
Vine Mare78%
$0.13↓#230170.25↓8.1 years↓
"This creature can't be blocked by black creatures."
Greater Realm of Preservation77%
$0.22↓#296040.17↓32.3 years↑
": The next time a black or red source of your choice would deal damage to you this turn, prevent that damage."
: The next time a black or red source of your choice would deal damage to you this turn, prevent that damage."