Ob Nixilis, the Adversary 
Legendary Planeswalker — Nixilis
$1.52 #8273 0.53 4.5 years
Casualty X. The copy isn't legendary and has starting loyalty X. (As you cast this spell, you may sacrifice a creature with power X. When you do, copy this spell. The copy becomes a token.)
+1: Each opponent loses 2 life unless they discard a card. If you control a Demon or Devil, you gain 2 life.
−2: Create a 1/1 red Devil creature token with "When this token dies, it deals 1 damage to any target."
−7: Target player draws seven cards and loses 7 life.
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Cards similar to Ob Nixilis, the Adversary 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.
Raphael, Fiendish Savior78%
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"At the beginning of each end step, if a creature card was put into your graveyard from anywhere this turn, create a 1/1 red Devil creature token with "When this token dies, it deals 1 damage to any target.""
+1 more matching line
Unholy Annex // Ritual Chamber74%
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"At the beginning of your end step, draw a card. If you control a Demon, each opponent loses 2 life and you gain 2 life. Otherwise, you lose 2 life."
Tibalt, Rakish Instigator72%
$0.27↓#11216↓0.27↓7.5 years↑
"−2: Create a 1/1 red Devil creature token with "When this token dies, it deals 1 damage to any target.""
Arterial Flow72%
$0.37↓#87130.33↓8.8 years↑
"Each opponent discards two cards. If you control a Vampire, each opponent loses 2 life and you gain 2 life."
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"Whenever an opponent draws their first card each turn, if it's not their turn, you create a 1/1 red Devil creature token with "When this token dies, it deals 1 damage to any target.""
+1 more matching line
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$0.26↓#17746↓0.31↓0.3 years↓
"
: Target player draws four cards."
: Target player draws four cards."+1 more matching line
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$0.23↓#22245↓0.00↓7.4 years↑
"
: This creature deals 1 damage to any target. Activate only if a creature died this turn."
: This creature deals 1 damage to any target. Activate only if a creature died this turn."
Staff of Nin70%
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": This artifact deals 1 damage to any target."
: This artifact deals 1 damage to any target."
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"
, : This artifact deals 4 damage to any target."
, : This artifact deals 4 damage to any target."
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$0.20↓#18548↓0.13↓25.1 years↑
": this card deals 3 damage to any target."
: this card deals 3 damage to any target."
Make Mischief70%
$0.23↓#18584↓0.00↓10.2 years↑
"this card deals 1 damage to any target. Create a 1/1 red Devil creature token. It has "When this token dies, it deals 1 damage to any target.""