Guardian Seraph 
Creature — Angel
$0.61 #21183 0.18 17.3 years
Flying
If a source an opponent controls would deal damage to you, prevent 1 of that damage.
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Cards similar to Guardian Seraph 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.
Protection of the Hekma100%
$0.25↓#26085↓0.47↑9.5 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Urza's Armor95%
$0.24↓#207750.00↓28.0 years↑
"If a source would deal damage to you, prevent 1 of that damage."
Orbs of Warding92%
$0.67↑#13293↑0.2511.3 years↓
"If a creature would deal damage to you, prevent 1 of that damage."
Hedron-Field Purists91%
$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."
Plated Pegasus89%
$0.30↓#222670.06↓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."
Sphere of Purity88%
$0.02↓#30817↓0.05↓23.0 years↑
"If an artifact would deal damage to you, prevent 1 of that damage."
Sphere of Reason88%
$0.24↓#30158↓0.1625.1 years↑
"If a blue source would deal damage to you, prevent 2 of that damage."
Sphere of Truth86%
$0.27↓#30111↓0.05↓25.1 years↑
"If a white source would deal damage to you, prevent 2 of that damage."
Sphere of Law86%
$0.62↑#27897↓0.32↑25.1 years↑
"If a red source would deal damage to you, prevent 2 of that damage."
Sphere of Duty85%
$0.19↓#29054↓0.1125.1 years↑
"If a green source would deal damage to you, prevent 2 of that damage."
Sphere of Grace84%
$0.27↓#29003↓0.38↑25.1 years↑
"If a black source would deal damage to you, prevent 2 of that damage."
Personal Sanctuary82%
$0.31↓#230680.2115.3 years↓
"During your turn, prevent all damage that would be dealt to you."
Archon of Coronation82%
$0.49↓#6727↑0.76↑5.9 years↓
"Flying"
Pentagram of the Ages82%
$0.42↓#28005↓0.1331.4 years↑
"
, 
: The next time a source of your choice would deal damage to you this turn, prevent that damage."
, : The next time a source of your choice would deal damage to you this turn, prevent that damage."
Shield of the Realm81%
$0.16↓#233390.268.5 years↓
"If a source would deal damage to equipped creature, prevent 2 of that damage."
Festival of the Guildpact80%
$0.20↓#252820.00↓21.0 years↑
"Prevent the next X damage that would be dealt to you this turn."
Reidane, God of the Worthy // Valkmira, Protector's Shield80%
$0.41↓#6442↑0.53↑5.7 years↓
"If a source an opponent controls would deal damage to you or a permanent you control, prevent 1 of that damage."
Thunderstaff80%
$0.26↓#217610.2422.7 years↑
"As long as this artifact is untapped, if a creature would deal combat damage to you, prevent 1 of that damage."
Reverse Damage79%
$0.39↓#190260.29↑33.2 years↑
"The next time a source of your choice would deal damage to you this turn, prevent that damage. You gain life equal to the damage prevented this way."
Shield of the Ages78%
$0.28↓#30760↓0.1131.4 years↑
": Prevent the next 1 damage that would be dealt to you this turn."
: Prevent the next 1 damage that would be dealt to you this turn."