Spellbane Centaur 
Creature — Centaur
$0.37 #28047 0.28 25.1 years
Creatures you control can't be the targets of blue spells or abilities from blue sources.
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Cards similar to Spellbane Centaur 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.
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"• Permanents you control can't be the targets of blue or black spells your opponents control this turn."