Urza's Armor 
Artifact
$0.24 #20775 0.00 28.0 years
If a source would deal damage to you, prevent 1 of that damage.
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Cards similar to Urza's Armor 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.
Guardian Seraph95%
$0.61↑#211830.18↑17.3 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Protection of the Hekma95%
$0.25↑#26085↓0.47↑9.5 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Orbs of Warding94%
$0.67↑#13293↑0.25↑11.3 years↓
"If a creature would deal damage to you, prevent 1 of that damage."
Energy Field86%
$1.52↑#14404↑0.47↑28.0 years
"Prevent all damage that would be dealt to you by sources you don't control."
Hedron-Field Purists84%
$0.36↑#226760.0016.5 years↓
"If a source would deal damage to you or a creature you control, prevent 1 of that damage."
Heart-Shaped Herb82%
$0.29↑#15360↑0.22↑0.3 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Sphere of Purity82%
$0.02↓#30817↓0.0523.0 years↓
"If an artifact would deal damage to you, prevent 1 of that damage."
Sphere of Reason82%
$0.24#30158↓0.16↑25.1 years↓
"If a blue source would deal damage to you, prevent 2 of that damage."
Plated Pegasus82%
$0.30↑#222670.0620.0 years↓
"If a spell would deal damage to a permanent or player, prevent 1 damage that spell would deal to that permanent or player."
Thunderstaff82%
$0.26↑#217610.24↑22.7 years↓
"As long as this artifact is untapped, if a creature would deal combat damage to you, prevent 1 of that damage."
Sphere of Truth80%
$0.27↑#30111↓0.0525.1 years↓
"If a white source would deal damage to you, prevent 2 of that damage."
Sphere of Law80%
$0.62↑#27897↓0.32↑25.1 years↓
"If a red source would deal damage to you, prevent 2 of that damage."
Sphere of Duty78%
$0.19↓#29054↓0.11↑25.1 years↓
"If a green source would deal damage to you, prevent 2 of that damage."
Sphere of Grace78%
$0.27↑#29003↓0.38↑25.1 years↓
"If a black source would deal damage to you, prevent 2 of that damage."
Personal Sanctuary77%
$0.31↑#230680.21↑15.3 years↓
"During your turn, prevent all damage that would be dealt to you."
Sanctum Custodian77%
$0.16↓#30515↓0.16↑28.0 years
"
: Prevent the next 2 damage that would be dealt to any target this turn."
: Prevent the next 2 damage that would be dealt to any target this turn."
Pentagram of the Ages76%
$0.42↑#28005↓0.13↑31.4 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."
Festival of the Guildpact76%
$0.20↓#25282↓0.0021.0 years↓
"Prevent the next X damage that would be dealt to you this turn."
Reidane, God of the Worthy // Valkmira, Protector's Shield75%
$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."
Shield of the Realm74%
$0.16↓#233390.26↑8.5 years↓
"If a source would deal damage to equipped creature, prevent 2 of that damage."