Blue Sun's Twilight 
Sorcery
$0.55 #4213 0.39 3.6 years
Gain control of target creature with mana value X or less. If X is 5 or more, create a token that's a copy of that creature.
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Cards similar to Blue Sun's Twilight 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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"Gain control of target creature if its power is less than or equal to the number of colors of mana spent to cast this spell."