Umbra Mystic 
Creature — Human Wizard
$6.58 #4263 0.30 16.4 years
Auras attached to permanents you control have umbra armor. (If an enchanted permanent you control would be destroyed, instead remove all damage from it and destroy an Aura attached to it.)
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Cards similar to Umbra Mystic 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.
Avacyn, Angel of Hope72%
$30.13↑#770↑1.35↑14.4 years↓
"Other permanents you control have indestructible."