Shield of the Realm 
Artifact — Equipment
$0.16 #23339 0.26 8.5 years
If a source would deal damage to equipped creature, prevent 2 of that damage.
Equip 
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Cards similar to Shield of the Realm 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.
Shield of the Avatar89%
$0.38↑#197030.47↑12.3 years↑
"If a source would deal damage to equipped creature, prevent X of that damage, where X is the number of creatures you control."
+1 more matching line
Blinding Powder86%
$0.45↑#18068↑0.06↓21.7 years↑
"Equipped creature has "Unattach this card: Prevent all combat damage that would be dealt to this creature this turn.""
+1 more matching line
Hedron-Field Purists84%
$0.36↑#226760.00↓16.5 years↑
"If a source would deal damage to you or a creature you control, prevent 2 of that damage."
Plated Pegasus82%
$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."
Protection of the Hekma82%
$0.25↑#260850.47↑9.5 years
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Guardian Seraph81%
$0.61↑#211830.1817.3 years↑
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
General's Kabuto80%
$8.32↑#13940↑0.2522.1 years↑
"Prevent all combat damage that would be dealt to equipped creature."
+1 more matching line
Daunting Defender80%
$0.09↓#29506↓0.06↓24.0 years↑
"If a source would deal damage to a Cleric creature you control, prevent 1 of that damage."
Magebane Armor78%
$0.97↑#15054↑0.1717.3 years↑
"Prevent all noncombat damage that would be dealt to equipped creature."
+1 more matching line
Shielded Passage78%
$0.09↓#213280.00↓13.7 years↑
"Prevent all damage that would be dealt to target creature this turn."
Squee's Toy78%
$0.16#188090.00↓29.0 years↑
"
: Prevent the next 1 damage that would be dealt to target creature this turn."
: Prevent the next 1 damage that would be dealt to target creature this turn."
Bubble Matrix78%
$11.27↑#188360.77↑29.4 years↑
"Prevent all damage that would be dealt to creatures."
Light of Sanction78%
$0.42↑#236780.06↓21.0 years↑
"Prevent all damage that would be dealt to creatures you control by sources you control."
Inviolability75%
$0.26↑#193980.3127.0 years↑
"Prevent all damage that would be dealt to enchanted creature."
Urza's Armor74%
$0.24↑#207750.00↓28.0 years↑
"If a source would deal damage to you, prevent 1 of that damage."
Mark of Asylum74%
$1.82↑#16849↑0.06↓17.7 years↑
"Prevent all noncombat damage that would be dealt to creatures you control."
Panther Habit74%
$1.82↑#10998↑0.330.3 years↓
"If equipped creature would be dealt damage, prevent that damage and put that many +1/+1 counters on it."
+1 more matching line
Orbs of Warding74%
$0.67↑#13293↑0.2511.3 years↑
"If a creature would deal damage to you, prevent 1 of that damage."
Redeem73%
$0.08↓#29195↓0.3328.0 years↑
"Prevent all damage that would be dealt this turn to up to two target creatures."
Recuperate72%
$0.07↓#30861↓0.00↓23.4 years↑
"• Prevent the next 6 damage that would be dealt to target creature this turn."