Laelia, the Blade Reforged 
Legendary Creature — Spirit Warrior
$0.28 #1316 0.28 5.4 years
Haste
Whenever Laelia attacks, exile the top card of your library. You may play that card this turn.
Whenever one or more cards are put into exile from your library and/or your graveyard, put a +1/+1 counter on Laelia.
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Cards similar to Laelia, the Blade Reforged 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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"Boast — 
: Exile the top card of your library. You may play that card this turn."
: Exile the top card of your library. You may play that card this turn."
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"At the beginning of your upkeep, exile the top card of your library. You may play that card this turn."
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"At the beginning of your upkeep, exile the top card of your library. You may play that card this turn."
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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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$0.15↓#15758↓0.06↓3.0 years↓
"Haste"
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"Whenever this card attacks, until end of turn, you may play a card exiled with this card."
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"Whenever a creature you control attacks alone, exile the top card of your library. You may play that card this turn."
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"Whenever this creature and at least two other creatures attack, exile the top card of your library. During any turn you attacked with three or more creatures, you may play that card."
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$0.29↑#8768↓0.43↑2.5 years↓
"Whenever this creature attacks, exile the top card of your library. You may get 
. If you don't, you may play that card this turn."
. If you don't, you may play that card this turn."+1 more matching line
Narset, Enlightened Master79%
$0.45↑#8444↓1.64↑11.9 years↑
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"Haste"
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"Haste"
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"Whenever this creature attacks, exile the top card of your library. If you've completed a dungeon, you may play that card this turn without paying its mana cost. Otherwise, you may play that card this turn."
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"At the beginning of your upkeep, exile the top card of your library. You may play it this turn."
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"Whenever a creature is exiled from the battlefield, put a +1/+1 counter on this creature."