Professor Onyx 
Legendary Planeswalker — Liliana
$4.64 #2413 0.56 5.5 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.
Witherbloom Apprentice89%
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"Whenever you cast or copy an instant or sorcery spell, each opponent loses 1 life and you gain 1 life."
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"When this artifact enters, 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."
+1 more matching line
Ripples of Undeath78%
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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."
and 3 life. If you do, put a card from among those cards into your hand."
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"+1: 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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"+1: Each opponent discards a card and loses 2 life."
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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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$0.22↓#8473↓0.12↓4.5 years↓
"• Look at the top five cards of your library. Put one of those cards into your hand and the rest into your graveyard."
+1 more matching line
Moonlight Bargain73%
$0.32↓#16093↓0.28↓21.0 years↑
"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."
Stargaze72%
$0.29↓#4069↓0.06↓2.2 years↓
"Look at twice X cards from the top of your library. Put X cards from among them into your hand and the rest into your graveyard. You lose X life."
Taigam, Sidisi's Hand72%
$0.22↓#17293↓0.12↓9.2 years↑
"At the beginning of your upkeep, look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard."
Crackling Doom72%
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"this card deals 2 damage to each opponent. Each opponent sacrifices a creature with the greatest power among creatures that player controls."
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"• Each player sacrifices a creature of their choice."
+1 more matching line
The Death of Gwen Stacy72%
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"Each player may discard a card. Each player who doesn't loses 3 life."
Tormented Hero72%
$0.16↓#23059↓0.24↓13.1 years↑
"Whenever you cast a spell that targets this creature, each opponent loses 1 life. You gain life equal to the life lost this way."
Vampire Neonate72%
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"
, 
: Each opponent loses 1 life and you gain 1 life."
, : 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."
Marchesa, Dealer of Death71%
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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."