Urza's Armor 
Artifact
$0.24 #20570 0.28 27.9 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%
$0.55↑#209830.42↑17.1 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Protection of the Hekma95%
$0.18↓#25865↓0.00↓9.4 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Orbs of Warding94%
$0.56↑#13137↑0.06↓11.1 years↓
"If a creature would deal damage to you, prevent 1 of that damage."
Hedron-Field Purists86%
$0.36↑#223270.3116.4 years↓
"If a source would deal damage to you or a creature you control, prevent 1 of that damage."
Energy Field86%
$1.88↑#14303↑0.2327.9 years
"Prevent all damage that would be dealt to you by sources you don't control."
Sphere of Reason85%
$0.24#29770↓0.3624.9 years↓
"If a blue source would deal damage to you, prevent 2 of that damage."
Sphere of Truth83%
$0.30↑#29756↓0.00↓24.9 years↓
"If a white source would deal damage to you, prevent 2 of that damage."
Sphere of Law83%
$0.61↑#27588↓0.53↑24.9 years↓
"If a red source would deal damage to you, prevent 2 of that damage."
Heart-Shaped Herb82%
$0.25↑#168010.00↓0.2 years↓
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Sphere of Purity82%
$0.02↓#30561↓0.42↑22.9 years↓
"If an artifact would deal damage to you, prevent 1 of that damage."
Sphere of Duty82%
$0.21↓#28636↓0.12↓24.9 years↓
"If a green source would deal damage to you, prevent 2 of that damage."
Sphere of Grace82%
$0.25↑#28705↓0.43↑24.9 years↓
"If a black source would deal damage to you, prevent 2 of that damage."
Plated Pegasus82%
$0.34↑#221820.3119.9 years↓
"If a spell would deal damage to a permanent or player, prevent 1 damage that spell would deal to that permanent or player."
Thunderstaff82%
$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."
Personal Sanctuary77%
$0.29↑#229030.57↑15.1 years↓
"During your turn, prevent all damage that would be dealt to you."
Sanctum Custodian77%
$0.15↓#30218↓0.2427.9 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%
$0.43↑#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."
Festival of the Guildpact76%
$0.22↓#25054↓0.54↑20.9 years↓
"Prevent the next X damage that would be dealt to you this turn."
Reidane, God of the Worthy // Valkmira, Protector's Shield75%
$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."
Healing Salve74%
$0.03↓#222930.06↓33.1 years↑
"• Prevent the next 3 damage that would be dealt to any target this turn."