Sphere of Law 
Enchantment
$0.62 #27897 0.32 25.1 years
If a red source would deal damage to you, prevent 2 of that damage.
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Cards similar to Sphere of Law 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: Red92%
$0.17↓#20581↑0.47↑33.2 years↑
"
: The next time a red source of your choice would deal damage to you this turn, prevent that damage."
: The next time a red source of your choice would deal damage to you this turn, prevent that damage."
Sphere of Grace88%
$0.27↓#290030.3825.1 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 Reason86%
$0.24↓#301580.16↓25.1 years
"If a blue source would deal damage to you, prevent 2 of that damage."
Protection of the Hekma86%
$0.25↓#260850.47↑9.5 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Guardian Seraph86%
$0.61↓#21183↑0.18↓17.3 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Rune of Protection: Red83%
$0.24↓#242150.06↓28.0 years↑
": The next time a red source of your choice would deal damage to you this turn, prevent that damage."
: The next time a red source of your choice would deal damage to you this turn, prevent that damage."
Sphere of Duty83%
$0.19↓#290540.11↓25.1 years
"If a green source would deal damage to you, prevent 2 of that damage."
Greater Realm of Preservation82%
$0.21↓#298870.07↓32.4 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."
Urza's Armor80%
$0.24↓#20775↑0.00↓28.0 years↑
"If a source would deal damage to you, prevent 1 of that damage."
Orbs of Warding78%
$0.67↑#13293↑0.2511.3 years↓
"If a creature would deal damage to you, prevent 1 of that damage."
Luminesce76%
$0.16↓#296130.2920.2 years↓
"Prevent all damage that black sources and red sources would deal this turn."
Hedron-Field Purists76%
$0.36↓#226760.00↓16.5 years↓
"If a source would deal damage to you or a creature you control, prevent 1 of that damage."
Circle of Protection: Black76%
$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."
Sphere of Purity74%
$0.02↓#308170.05↓23.0 years↓
"If an artifact would deal damage to you, prevent 1 of that damage."
Circle of Protection: White74%
$0.11↓#19318↑0.3833.2 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."
Circle of Protection: Blue74%
$0.09↓#22047↑0.2733.2 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."
Plated Pegasus74%
$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."
Burrenton Forge-Tender72%
$0.18↓#238640.00↓19.0 years↓
"Sacrifice this creature: Prevent all damage a red source of your choice would deal this turn."
Red Scarab72%
$0.33↓#265250.2731.4 years↑
"Enchanted creature can't be blocked by red creatures."