Burden of Proof 

Enchantment — Aura
$0.04 #23477 0.56 2.7 years
Flash
Enchant creature
Enchanted creature gets +2/+2 as long as it's a Detective you control. Otherwise, it has base power and toughness 1/1 and can't block Detectives.
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Cards similar to Burden of Proof 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.
Mishra's Domination84%
$0.08↑#235010.07↓3.9 years↑
"As long as you control enchanted creature, it gets +2/+2. Otherwise, it can't block."
+1 more matching line
Illusory Wrappings73%
$0.08↑#281520.44↓9.5 years↑
"Enchanted creature has base power and toughness 0/2."
+1 more matching line