Professor Onyx 
Legendary Planeswalker — Liliana
$5.32 #2391 0.60 5.4 years
Magecraft — Whenever you cast or copy an instant or sorcery spell, each opponent loses 2 life and you gain 2 life.
+1: You lose 1 life. Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.
−3: Each opponent sacrifices a creature with the greatest power among creatures that player controls.
−8: Each opponent may discard a card. If they don't, they lose 3 life. Repeat this process six more times.
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Cards similar to Professor Onyx 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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"At the beginning of your first main phase, mill three cards. Then you may pay 
and 3 life. If you do, put a card from among those cards into your hand."
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"Look at the top four cards of your library. Put two of them into your hand and the rest into your graveyard. You lose 2 life."
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"Look at the top five cards of your library. For each card, put that card into your graveyard unless you pay 2 life. Then put the rest into your hand."
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"
, 
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, : Each opponent loses 1 life and you gain 1 life."
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", , Discard a card: Each player loses 2 life."
, , Discard a card: Each player loses 2 life."
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"Whenever you commit a crime, you may pay . If you do, look at the top two cards of your library. Put one of them into your hand and the other into your graveyard."
. If you do, look at the top two cards of your library. Put one of them into your hand and the other into your graveyard."
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", , Sacrifice this card: Each opponent who lost life this turn sacrifices a creature with the greatest power among creatures they control."
, , Sacrifice this card: Each opponent who lost life this turn sacrifices a creature with the greatest power among creatures they control."+1 more matching line