Ob Nixilis, Captive Kingpin 
Legendary Creature — Demon
$15.93 #4439 0.76 3.3 years
Flying, trample
Whenever one or more opponents each lose exactly 1 life, put a +1/+1 counter on Ob Nixilis. Exile the top card of your library. Until your next end step, you may play that card.
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Cards similar to Ob Nixilis, Captive Kingpin 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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"
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: Exile the top card of your library. Until your next end step, you may play it."
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"Whenever this creature attacks while saddled, exile the top card of your library. Until the end of your next turn, you may play that card."
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, Discard a card: Exile the top card of your library. Until the end of your next turn, you may play that card."
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