Guardian Seraph 
Creature — Angel
$0.55 #20983 0.42 17.1 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%
$0.18↓#25865↓0.00↓9.4 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Urza's Armor95%
$0.24↓#205700.28↓27.9 years↑
"If a source would deal damage to you, prevent 1 of that damage."
Hedron-Field Purists93%
$0.36↓#223270.31↓16.4 years
"If a source would deal damage to you or a creature you control, prevent 1 of that damage."
Orbs of Warding92%
$0.56↑#13137↑0.06↓11.1 years↓
"If a creature would deal damage to you, prevent 1 of that damage."
Sphere of Reason90%
$0.24↓#29770↓0.3624.9 years↑
"If a blue source would deal damage to you, prevent 2 of that damage."
Plated Pegasus89%
$0.34↓#221820.31↓19.9 years↑
"If a spell would deal damage to a permanent or player, prevent 1 damage that spell would deal to that permanent or player."
Sphere of Purity88%
$0.02↓#30561↓0.4222.9 years↑
"If an artifact would deal damage to you, prevent 1 of that damage."
Sphere of Truth88%
$0.30↓#29756↓0.00↓24.9 years↑
"If a white source would deal damage to you, prevent 2 of that damage."
Sphere of Law87%
$0.61↑#27588↓0.53↑24.9 years↑
"If a red source would deal damage to you, prevent 2 of that damage."
Sphere of Duty86%
$0.21↓#28636↓0.12↓24.9 years↑
"If a green source would deal damage to you, prevent 2 of that damage."
Sphere of Grace86%
$0.25↓#28705↓0.4324.9 years↑
"If a black source would deal damage to you, prevent 2 of that damage."
Personal Sanctuary82%
$0.29↓#229030.57↑15.1 years↓
"During your turn, prevent all damage that would be dealt to you."
Pentagram of the Ages82%
$0.43↓#27693↓0.18↓31.3 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%
$0.14↓#230380.00↓8.4 years↓
"If a source would deal damage to equipped creature, prevent 2 of that damage."
Festival of the Guildpact80%
$0.22↓#250540.54↑20.9 years↑
"Prevent the next X damage that would be dealt to you this turn."
Reidane, God of the Worthy // Valkmira, Protector's Shield80%
$0.44↓#6365↑0.71↑5.6 years↓
"If a source an opponent controls would deal damage to you or a permanent you control, prevent 1 of that damage."
Thunderstaff80%
$0.27↓#214990.00↓22.6 years↑
"As long as this artifact is untapped, if a creature would deal combat damage to you, prevent 1 of that damage."
Reverse Damage79%
$0.41↓#188640.4533.1 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%
$0.24↓#30510↓0.00↓31.3 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."
Invulnerability78%
$0.30↓#26094↓0.07↓28.9 years↑
"The next time a source of your choice would deal damage to you this turn, prevent that damage."