Champion's Helm 
Artifact — Equipment
$0.98 #738 0.26 15.3 years
Equipped creature gets +2/+2.
As long as equipped creature is legendary, it has hexproof. (It can't be the target of spells or abilities your opponents control.)
Equip 
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Cards similar to Champion's Helm 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.
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"
: Equipped creature gains hexproof until end of turn."
: Equipped creature gains hexproof until end of turn."+1 more matching line
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"When this Aura enters, enchanted creature gains hexproof until end of turn."
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"When this Aura enters, enchanted creature gains hexproof until end of turn."
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"When this Aura enters, enchanted creature gains hexproof until end of turn."
Patriot, Shield Wielder76%
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", 
: Another target creature you control gets +2/+0 and gains hexproof until end of turn."
, : Another target creature you control gets +2/+0 and gains hexproof until end of turn."
Swiftfoot Boots76%
$1.47↑#12↑0.37↑15.3 years
"Equipped creature has hexproof and haste."
+1 more matching line
Plumecreed Escort76%
$0.26↓#4350↓0.00↓2.2 years↓
"When this creature enters, target creature you control gains hexproof until end of turn."
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"Equip "
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"When this Aura enters, enchanted creature gains hexproof until end of turn."
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"Equipped creature gets +0/+3."
+1 more matching line
Stolen Stark Tech73%
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"Equipped creature gets +1/+0."
+1 more matching line