Shield of the Realm 
Artifact — Equipment
$0.14 #23038 0.00 8.4 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%
$0.33↑#194140.25↑12.1 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%
$0.42↑#17854↑0.12↑21.6 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↑#223270.31↑16.4 years↑
"If a source would deal damage to you or a creature you control, prevent 2 of that damage."
Plated Pegasus82%
$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."
Protection of the Hekma82%
$0.18↑#258650.009.4 years
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Guardian Seraph81%
$0.55↑#209830.42↑17.1 years↑
"If a source an opponent controls would deal damage to you, prevent 1 of that damage."
Daunting Defender81%
$0.09↓#29214↓0.14↑23.9 years↑
"If a source would deal damage to a Cleric creature you control, prevent 1 of that damage."
General's Kabuto80%
$8.20↑#13840↑0.41↑21.9 years↑
"Prevent all combat damage that would be dealt to equipped creature."
+1 more matching line
Shielded Passage80%
$0.04↓#211080.36↑13.6 years↑
"Prevent all damage that would be dealt to target creature this turn."
Magebane Armor78%
$0.93↑#14774↑0.42↑17.1 years↑
"Prevent all noncombat damage that would be dealt to equipped creature."
+1 more matching line
Kei Takahashi78%
$0.18↑#30001↓0.0032.3 years↑
"
: Prevent the next 2 damage that would be dealt to target creature this turn."
: Prevent the next 2 damage that would be dealt to target creature this turn."
Squee's Toy78%
$0.14#189060.0728.9 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%
$11.59↑#189360.89↑29.2 years↑
"Prevent all damage that would be dealt to creatures."
Light of Sanction78%
$0.42↑#233930.47↑20.9 years↑
"Prevent all damage that would be dealt to creatures you control by sources you control."
Inviolability75%
$0.20↑#193660.16↑26.9 years↑
"Prevent all damage that would be dealt to enchanted creature."
Urza's Armor74%
$0.24↑#205700.28↑27.9 years↑
"If a source would deal damage to you, prevent 1 of that damage."
Redeem74%
$0.08↓#29098↓0.19↑27.9 years↑
"Prevent all damage that would be dealt this turn to up to two target creatures."
Mark of Asylum74%
$1.82↑#16626↑0.0617.6 years↑
"Prevent all noncombat damage that would be dealt to creatures you control."
Panther Habit74%
$2.63↑#12221↑0.000.2 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%
$0.56↑#13137↑0.0611.1 years↑
"If a creature would deal damage to you, prevent 1 of that damage."