Dog Umbra 

Enchantment — Aura
$0.22 #7066 0.28 2.2 years
Flash
Enchant creature
As long as another player controls enchanted creature, it can't attack or block. Otherwise, this Aura has 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 Dog 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.
Detained by Legionnaires82%
$0.12↓#17704↓0.55↑2.2 years
"Enchanted creature can't attack or block."
+1 more matching line
Luminous Bonds82%
$0.04↓#18993↓0.318.6 years↑
"Enchanted creature can't attack or block."
+1 more matching line
Mishra's Domination81%
$0.09↓#23026↓0.263.8 years↑
"As long as you control enchanted creature, it gets +2/+2. Otherwise, it can't block."
Recumbent Bliss80%
$0.12↓#19457↓0.2718.1 years↑
"Enchanted creature can't attack or block."
+1 more matching line
Path to Redemption78%
$0.10↓#10143↓0.00↓0.8 years↓
"Enchanted creature can't attack or block."
+1 more matching line
Fog on the Barrow-Downs78%
$0.16↓#17864↓0.44↑3.2 years
"Enchanted creature is a Spirit and can't attack or block."
+1 more matching line
Song of Serenity78%
$0.23↑#29262↓0.71↑28.2 years↑
"Creatures that are enchanted can't attack or block."
Bound in Silence78%
$0.11↓#19180↓0.41↑19.3 years↑
"Enchanted creature can't attack or block."
+1 more matching line
Lawmage's Binding77%
$0.19↓#16292↓0.317.6 years↑
"Enchanted creature can't attack or block, and its activated abilities can't be activated."
+2 more matching lines