Thought Harvester 
Creature — Eldrazi Drone
$0.16 #22577 0.44 10.7 years
Devoid (This card has no color.)
Flying
Whenever you cast a colorless spell, target opponent exiles the top card of their library.
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Cards similar to Thought Harvester 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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"Devoid"
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