Red Scarab 
Enchantment — Aura
$0.33 #26525 0.27 31.4 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.
Red Ward88%
$0.16↓#249080.1933.2 years↑
"Enchanted creature has protection from red. This effect doesn't remove this Aura."
Black Scarab86%
$0.25↓#248320.12↓31.4 years
"Enchanted creature can't be blocked by black creatures."
+1 more matching line
Barrenton Cragtreads85%
$0.12↓#318160.06↓18.5 years↓
"This creature can't be blocked by red creatures."
White Scarab84%
$0.24↓#251100.05↓31.4 years
"Enchanted creature can't be blocked by white creatures."
+1 more matching line
Blue Scarab83%
$0.24↓#252420.2531.4 years
"Enchanted creature can't be blocked by blue creatures."
+2 more matching lines
Green Scarab82%
$0.27↓#260420.12↓31.4 years
"Enchanted creature can't be blocked by green creatures."
+2 more matching lines
Controlled Instincts82%
$0.08↓#307210.38↑17.7 years↓
"Enchant red or green creature"
Galina's Knight80%
$0.26↓#301280.06↓26.0 years↓
"Protection from red"
Vedalken Outlander80%
$0.05↓#307090.00↓17.7 years↓
"Protection from red"
Oraxid80%
$0.09↓#266260.00↓26.7 years↓
"Protection from red"
Vulshok Refugee80%
$0.17↓#314780.2715.4 years↓
"Protection from red"
Repentant Blacksmith80%
$0.13↓#311160.00↓32.8 years↑
"Protection from red"
Mind Harness80%
$0.32↓#20442↑0.73↑30.0 years↓
"Enchant red or green creature"
Encase in Ice80%
$0.05↓#280510.45↑11.6 years↓
"Enchant red or green creature"
Shield Mare78%
$0.12↓#15475↑0.00↓8.3 years↓
"This creature can't be blocked by red creatures."
Mask of Law and Grace78%
$1.63↑#11081↑0.1827.4 years↓
"Enchanted creature has protection from black and from red."
+1 more matching line
Aven Smokeweaver78%
$0.21↓#292340.1825.1 years↓
"Flying, protection from red"
Thermal Glider78%
$0.13↓#272050.00↓27.0 years↓
"Flying, protection from red"
Hazerider Drake78%
$0.24↓#31951↓0.50↑30.0 years↓
"Flying, protection from red"
Sea Sprite78%
$0.20↓#270780.00↓31.1 years
"Flying, protection from red"