Blue Scarab 
Enchantment — Aura
$0.27 #25000 0.00 31.3 years
Enchant creature
Enchanted creature can't be blocked by blue creatures.
Enchanted creature gets +2/+2 as long as an opponent controls a blue permanent.
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Cards similar to Blue 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.
Mudbrawler Raiders90%
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"This creature can't attack unless defending player controls a blue permanent."
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"Whenever a player casts a blue spell, this creature gets +2/+2 until end of turn."