Ob Nixilis, the Adversary
Legendary Planeswalker — Nixilis
Oracle Text
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.Rules for this card
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A keyword ability that allows you to sacrifice a creature to create a copy of a spell. See 702.153, “Casualty.”
Rulings (7)
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Wizards of the CoastAs you cast a spell with casualty X, you choose whether to pay its casualty cost and what the value of X will be.
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Wizards of the CoastThe copy of the spell is created on the stack, so it's not "cast." Abilities that trigger when a player casts a spell won't trigger.
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Wizards of the CoastCasualty N means "As an additional cost to cast this spell, you may sacrifice a creature with power N or greater." and "When you cast this spell, if a casualty cost was paid for it, copy it. If the spell has any targets, you may choose new targets for the copy."
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Wizards of the CoastYou can control exactly one legendary Ob Nixilis, the Adversary and any number of nonlegendary copies of Ob Nixilis, the Adversary.
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Wizards of the CoastYou may sacrifice only one creature to pay a spell's casualty cost, and you copy the spell only once.
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Wizards of the CoastThe copied spell from Ob Nixilis, the Adversary's triggered ability copies exactly what is printed on Ob Nixilis, except its starting loyalty is equal to the chosen value of X and it isn't legendary. The copy becomes a token as it resolves.
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Wizards of the CoastIf you pay the casualty cost of a spell, the copy will resolve before the original spell.