Bear Umbra 
Enchantment — Aura
$12.66 #879 0.61 16.4 years
Enchant creature
Enchanted creature gets +2/+2 and has "Whenever this creature attacks, untap all lands you control."
Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)
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Cards similar to Bear Umbra 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.
Octopus Umbra79%
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"Umbra armor"
Wilderness Reclamation74%
$2.92↓#9370.74↑7.6 years↓
"At the beginning of your end step, untap all lands you control."
Urban Burgeoning74%
$0.19↓#13977↓0.35↓13.9 years↓
"Enchanted land has "Untap this land during each other player's untap step.""
One with Nature74%
$1.04↓#7052↓0.00↓23.3 years↑
"Enchant creature"
Crab Umbra73%
$0.43↓#11709↓0.18↓16.4 years
"Umbra armor"
+1 more matching line
Molting Snakeskin70%
$0.05↓#22880↓0.06↓11.9 years↓
"Enchant creature"
Skeletal Grimace70%
$0.19↓#17752↓0.00↓14.9 years↓
"Enchant creature"
Aqueous Form70%
$0.30↓#7550.25↓12.9 years↓
"Enchant creature"