Red Scarab 
Enchantment — Aura
$0.32 #26281 0.00 31.3 years
Enchant creature
Enchanted creature can't be blocked by red creatures.
Enchanted creature gets +2/+2 as long as an opponent controls a red permanent.
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Cards similar to Red 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.
Barrenton Cragtreads90%
$0.06↓#31628↓0.19↑18.3 years↓
"This creature can't be blocked by red creatures."
Red Ward84%
$0.16↓#246320.56↑33.1 years↑
"Enchanted creature has protection from red. This effect doesn't remove this Aura."
+1 more matching line