Black Scarab 
Enchantment — Aura
$0.25 #24832 0.12 31.4 years
Enchant creature
Enchanted creature can't be blocked by black creatures.
Enchanted creature gets +2/+2 as long as an opponent controls a black permanent.
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Cards similar to Black Scarab 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.
Black Ward88%
$0.24↓#234600.00↓33.2 years↑
"Enchanted creature has protection from black. This effect doesn't remove this Aura."
+1 more matching line
Raven's Run Dragoon86%
$0.10↓#31828↓0.00↓18.5 years↓
"This creature can't be blocked by black creatures."
Red Scarab86%
$0.33↑#265250.27↑31.4 years
"Enchanted creature can't be blocked by red creatures."
+1 more matching line
Blue Scarab85%
$0.24↓#252420.25↑31.4 years
"Enchanted creature can't be blocked by blue creatures."
+2 more matching lines
Radiant Essence85%
$0.23↓#32256↓0.00↓30.0 years↓
"This creature gets +1/+2 as long as an opponent controls a black permanent."
Green Scarab84%
$0.27↑#260420.1231.4 years
"Enchanted creature can't be blocked by green creatures."
+2 more matching lines
White Scarab84%
$0.24↓#251100.0531.4 years
"Enchanted creature can't be blocked by white creatures."
+1 more matching line
Vine Mare83%
$0.12↓#232720.00↓8.3 years↓
"This creature can't be blocked by black creatures."
Valeron Outlander81%
$0.05↓#31327↓0.00↓17.7 years↓
"Protection from black"
Llanowar Knight81%
$0.16↓#30331↓0.0726.0 years↓
"Protection from black"
Scalebane's Elite81%
$0.16↓#32254↓0.00↓29.7 years↓
"Protection from black"
Death Speakers81%
$0.16↓#29802↓0.0731.1 years
"Protection from black"
Starlight80%
$0.22↓#30700↓0.00↓29.5 years↓
"You gain 3 life for each black creature target opponent controls."
Nightwind Glider80%
$0.07↓#268190.2027.0 years↓
"Flying, protection from black"
Voice of Grace80%
$0.31↑#282760.0628.0 years↓
"Flying, protection from black"
Melesse Spirit80%
$0.16↓#30646↓0.1830.0 years↓
"Flying, protection from black"
Duskrider Falcon80%
$0.22↓#232820.1329.4 years↓
"Flying, protection from black"
Cemetery Gate79%
$0.18↓#252210.22↑31.1 years
"Protection from black"
Wall of Light79%
$5.03↑#266670.0732.4 years↑
"Protection from black"
Righteous Indignation79%
$0.13↓#31776↓0.1127.0 years↓
"Whenever a creature blocks a black or red creature, the blocking creature gets +1/+1 until end of turn."