Brainstealer Dragon {5}{B}{B}
Creature — Dragon Horror
Flying
At the beginning of your end step, exile the top card of each opponent's library. You may play those cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any color to cast it.
Whenever a nonland permanent an opponent owns enters the battlefield under your control, they lose life equal to its mana value.
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Cards that do something similar 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.
Prosper, Tome-Bound 85%
#2234
"At the beginning of your end step, exile the top card of your library. Until the end of your next turn, you may play that card."
Rocco, Street Chef 83%
$0.39#6816
"At the beginning of your end step, each player exiles the top card of their library. Until your next end step, each player may play the card they exiled this way."
Arvinox, the Mind Flail 80%
$0.38#4746
"At the beginning of your end step, exile the bottom card of each opponent's library face down. For as long as those cards remain exiled, you may look at them, you may cast permanent spells from among them, and you may spend mana as though it were mana of any color to cast those spells."