Champion's Helm 
Artifact — Equipment
$1.26 #747 0.21 15.2 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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"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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", 
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"When this creature enters, target creature you control gains hexproof until end of turn."
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"Equipped creature gets +1/+0."
+1 more matching line