Burden of Proof 
Enchantment — Aura
$0.03 #23129 0.27 2.6 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%
$0.09↑#230260.263.8 years↑
"As long as you control enchanted creature, it gets +2/+2. Otherwise, it can't block."
Serra's Boon84%
$0.22↑#29390↓0.2519.6 years↑
"Enchant creature"
Dog Umbra83%
$0.22↑#7066↑0.282.2 years
"Enchant creature"
Nyx Infusion82%
$0.05↑#29418↓0.00↓12.3 years↑
"Enchant creature"
Tahngarth's Rage82%
$0.19↑#265670.00↓28.9 years↑
"Enchant creature"
Mystic Subdual81%
$0.12↑#16004↑0.316.4 years↑
"Flash"
Sea Legs81%
$0.05↑#258250.298.6 years↑
"Flash"
Fresh Start81%
$0.30↑#12828↑0.281.4 years↓
"Enchant creature"
Merfolk Trickster80%
$0.25↑#9781↑0.44↑8.4 years↑
"Flash"
The Wondrous Wasp80%
$1.30↑#13995↑0.00↓0.2 years↓
"Flash"
Heliod's Punishment80%
$0.14↑#15076↑0.07↓6.6 years↑
"Enchant creature"
Darksteel Mutation78%
$1.06↑#582↑0.97↑12.8 years↑
"Enchant creature"
Frogify78%
$0.23↑#4626↑0.49↑6.9 years↑
"Enchant creature"
Amphibian Downpour77%
$1.84↑#1227↑0.79↑2.2 years
"Flash"
+1 more matching line
Hammerhand77%
$0.05↑#15098↑0.00↓12.1 years↑
"Enchant creature"
Affa Guard Hound76%
$0.09↑#228300.06↓16.4 years↑
"Flash"
Bogardan Rager76%
$0.07↑#28374↓0.2019.9 years↑
"Flash"
Duskmourn's Domination76%
$0.10↑#231000.231.9 years
"Enchant creature"
Noggle the Mind75%
$0.28↑#11278↑0.00↓0.6 years↓
"Flash"
Cast into Darkness74%
$0.14↑#239520.10↓12.3 years↑
"Enchant creature"